Top 15 Best Exterior Caulk for 2021 (Updated) Buying Guide
Are cracks diminishing the beauty of your driveway? Are they letting water, dust or insects, and cold air into your house?
You need the best exterior caulk to seal them up.
With this, you’ll be able to restore the beauty of the structures around your home while stopping moisture and those little crawling creatures from getting into your house.
A good home improvement professional will tell you that besides those benefits, caulking acts as a good insulator for your home.
Finding the best outdoor caulk isn’t an easy task considering the thousands of brands and products on the market, and that’s why we’re here.
We’ve done the legwork for you, and below, we’ve reviewed some of the finest, most popular, most effective outdoor caulking products. Read on and see if there’s one or more that suit you.
Okay, so let's start...
Dap Alex Plus (Silicone Acrylic Latex, 5.5 oz
Superior quality, versatility, excellent adhesion, and resistance to elements are some of the reasons why the Dap Alex Plus is our top pick.
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Our Top 15 Best Exterior Caulk Reviews 2020
1. Dap Alex Plus Silicone and Acrylic Latex Caulk
- This product is a 5.5Oz Acry Latex Caulk
- Purpose of use for Caulk & Sealants, adhesive-caulk
- Manufactured in the United States
- Superior quality, moisture and resistant caulk
- Sold as 4 pack
Superior quality, versatility, excellent adhesion, and resistance to elements are some of the reasons why the Dap Alex Plus is at the top of this list.
This is a silicone acrylic-latex formula that comes with immense flexibility.
Rather that being destroyed by the movements of the house or the gaps, the sealant stretches and compresses with the movements.
This phenomenon is pretty beneficial, ensuring the sealant doesn’t develop cracks or go loose.
The product’s adhesiveness is unbelievably powerful. When you apply it to the surface, it holds on tightly for decades. Snow, dust, and other elements won’t break the bond.
It is, thus, a caulk you can rely on to provide that lasting protection or seal.
Yes, rainwater is known to wash off adhesives but that’s nothing to worry about when you’re using the Dap Alex Plus Acrylic Latex Caulk.
This is a robust, water-resistant adhesive that keeps the gaps sealed even during the rainy season.
If you need the best caulk for exterior windows and doors that will keep the moisture from getting in, this one will do.
Mildew and mold are other factors known to discolor and destroy caulking, but even these aren’t a concern. The product is formulated to resist both of them for decades, keeping the job intact and unstained.
The main complaint with this product is that it’s a little overpriced for such a small quantity. But all in all, the product is a great selection as it’s easy to apply, effective at sealing spaces, and able to provide lasting protection.
Go on and see what other users have to say about it on Amazon.
2. Sashco Big Stretch Acrylic-latex Caulking (12pack, 10.5 oz each)
- Big Stretch is a high-performance water-based elastomeric sealant with powerful adhesion and superior elasticity
- It spans gaps up to 2" wide and stretches up to 500% of original joint size without cracking
- Interior and exterior applications including windows, doors, siding, vents, soffits, baseboards, eaves, crown moulding and sound-proofing interior walls
- Adheres to aluminum, brass, steel, anodized windows, abs, lexan, acrylic sheet, plexiglass, PVC, fiberglass, urethane, vinyl, polycarbonate, polystyrene, nylon, asphalt, tile, cinder block, corian,...
- Its powerful adhesion and extreme elasticity will stick, twist, bend, compress and stretch more than 500% of original size
If you’re looking for good caulking that holds paint well and that doesn’t come with shrinking issues, try the Sashco Big Stretch.
This is an inexpensive professional-level product being availed to the regular customer.
Unlike many other caulks in the market, this product doesn’t crack. Stretching up to 5 times the original joint size, the product has all the elasticity needed to keep it intact.
Thus, even if the joint is bombarded by stretch forces, the application stays flawless, without cracks.
If you have used many caulking products before, chances are that you know exactly how important the adhesive properties of a sealant are.
Big Stretch offers you superior adhesive strength, powerfully holding onto the surface you’re sealing.
The coolest part is that it adheres to a wide range of building surfaces, including aluminum, steel, fiberglass, PVC, wood, concrete, stone, stucco, drywall, and more.
In fact, whatever surface you want to seal, there’s a good chance that Big Stretch will work.
An even more amazing part is the longevity.
This is not the kind of caulk you have to scrape after a few years because of cracking or peeling. It’s pretty resistant to water and with its stretch capability, it stays on there for many years.
Another perk is that it’s paintable. So, it makes a good sealant for outdoor areas or any parts you want to paint.
That being said, this caulk dries really fast. Hence, you have to do your finish work quickly, and you got to be careful not to get it on your hands or other unwanted surfaces because cleaning it up with water isn’t easy.
All in all, the Sashco Big Stretch is some of the best exterior paintable caulk in the market. Try it and see for yourself.
3. Dap 18110 Acrylic Latex Caulk With Silicone
- All purpose acrylic latex caulk plus silicone is highly flexible, durable, and creates a long lasting waterproof seal
- Alex Plus has strong multi-surface adhesion and won't shine through or discolor paint
- Cured caulk is mold & mildew resistant
- Acrylic latex sealant is low in odor and cleans up easy with water
- Paintable in just 30 minutes
From almond and black to slate gray and clear, Dap offers you one of the widest selections of caulk finishes. With such a variety of choices, it’s easy to choose the product that suits your needs perfectly.
One of the reasons as to why the Dap 18110 Caulk is one of the most preferred caulking products is that it is paintable. And not only that; you can paint over it after just 30 minutes of applications.
Again, it holds onto paint really well.
You’ll be glad to know that this caulk is moisture- and mildew-resistant. Now, when looking for a caulk to use in spaces that are going to be exposed to moisture, such as the windows, it’s always advisable to get a product that’s resistant to mildew.
Why? Mildew and moisture can break down your product, rendering it useless quickly.
So, being resistant to these elements, your application has a good chance of surviving many years.
Speaking of durability, this product is built to provide lasting protection. It is a premium quality sealant that holds onto surfaces powerfully, lasting decades without coming off.
Over time, your house moves. Even though the movement is mostly only slight, it can affect any sealant products applied to the gaps around your house.
But that’s not a problem when you’re using the Dap 18110 Caulk. Being flexible, this sealant moves with the stretch.
Pressure forcing the gaps to be smaller compresses the caulk and may cause it to crack. But once again, that’s not a problem to fret about because the product’s flexibility prevents the formation of cracks.
The only issue is that this acrylic latex caulk tends to bubble when you dispense it quickly, so you have to go slowly. Other than that, it’s pretty nice stuff that you’re likely to love.
4. GE Silicone 2+ Window & Door Caulk
- 100% WEATHERPROOF: This 100% silicone formula offers excellent protection from water damage, providing a reliable seal in areas prone to consistent weather and water exposure
- 10-YEAR MOLD-FREE PRODUCT PROTECTION: Protects against stain-causing mold and mildew water damage
- 40% MORE FLEXIBILITY & 5X STRONGER ADHESION: Stays permanently flexible with strong adhesion and provides a durable seal for exterior and interior projects
- 30-MINUTE RAIN-READY: Ready for rain exposure in as little as 30 minutes
- SHRINK & CRACK-PROOF: Withstands extreme expansion or contraction associated with temperature fluctuations
If you’re looking best exterior caulk for both exterior and interior use and you’re not planning to paint on it, then the GE Silicone 2+ is for you.
Being sun-proof, this is the kind of caulk you want to use on a place that’s unprotected from direct sunlight. Unlike the cheap sealants that start cracking the minute they’re heated up by the sun, this one remains strong with no signs of cracks on it.
It’s also freeze-proof. Therefore, you can use it in the bathroom and on the exterior parts that are exposed to the cold at night or during winter, without worrying about shrinking issues.
Are you concerned about cracks? You’ll be happy to know that this product is highly flexible and doesn’t crack.
If you’ve used caulks before, you might have come across products advertised as “clear” or “crystal clear” only to be disappointed after using them.
You squeeze out the sealant, and it comes out clear, but upon setting, it’s milky. Pretty disappointing, isn’t it?
Well, if you want to avoid that feeling, we suggest you use the GE Silicone 2+. This is not one of those products that are deceptively advertised as clear. It really is clear.
If you have clear acrylic roof panels that you want to seal, this product will be very helpful.
The only drawback that this product presents is that it doesn’t hold onto to paint. Therefore, you want to use it only where you don’t plan to paint afterwards.
Other than that, it’s a durable sealant that performs wonderfully. The guarantee is 50 years!
05. Red Devil 0848 EZ Squeeze Exterior Caulk For Door & Windows
- MULTI PURPOSE FORMULA: Can be used inside or outside on a variety of substrates
- EXCELLENT ADHESION: Provides a long lasting repair
- DRIES QUICKLY: Makes a fast repair
- PAINTABLE: Can be painted to match any desired color
- WATER CLEAN UP: Cleans up easily with soap and water
If you need some specialized sealant for your drywall, tiles, windows, and doors or any other part of your house, then the Red Devil is the go-to brand.
The 0848 EZ SQUEEZE is available in 6 options, all of which are formulated with specific ingredients to offer sealing power for varying applications.
Because of this specialization, the product is one of the most effective in the market. If you have a gap that is problematic to seal, and maybe you’ve tried other sealants with little or no success, then this is the product to use.
It resists moisture and mildew efficiently, and hence your application stays on for a long time.
The coolest thing about this product is that it can be used both interiorly and exteriorly.
So, whether you want to seal those parts where the crown meets the ceiling or those leaky parts of the roof, then you can rely on this product.
A caulking gun comes in handy for applying the sealant. But what if you don’t have it? You don’t have anything to worry about as the bottle that this product is contained in is built for flawless application.
It has a patented design that makes the application as easy as rolling a lid. Extremely easy and convenient to use.
Want to paint the surface you’re sealing, so it matches with the surrounding areas? No problem! This sealant is totally paintable, holding your paint firmly.
Some users have pointed out that the cost is a little high. That being said, the service is excellent and rather than playing trial and error with some cheap sealant, perhaps using this product is the more economical route in the long run.
Go on to amazon and check it out for yourself.
06. White Lightning 30010 Painter's Preferred Acrylic Latex Caulk
- Ideal for use on doors, windows and trim work.
- Painter's Preferred remains flexible and provides a watertight seal.
- Dries to a paintable finish.
- For use on wood and glass.
- Meets ASTM Specification C-834, Grade NF.
If you’re a beginner, then you need a caulk that you can clean easily before it dries. The White Lightning 30010 is a water-based latex formula that you can clean easily with water and sponge before drying.
That gives you the ability to rectify your mistakes, and it’s a great perk for beginners.
Do you know why this is dubbed the “painter’s preferred”?
Because of its extraordinary capability to hold paint. The coolest part is that in just 2 hours of application, you can paint over it, with a latex or oil based paint.
In case the temperatures are cool or there’s high humidity, it’s advisable to wait a bit longer before painting.
If you’re looking for a sealant that can hold firmly to wooden or glass surfaces, this is the one to get. You’ll be surprised how firmly it adheres to the surfaces.
Moreover, the caulk forms a lasting bond, keeping the gap closed for decades. It is resistant to water, so you don’t have to worry about the rain getting through.
The ability of the sealant to remain flexible through time is another perk you’re going to find useful. No need to worry about the extension of the gaps causing the sealant coming off.
Our only concern with this acrylic latex caulk is that the tube seems weak, and a few users have complained that theirs arrived broken. But the brand is working on rectifying that, and currently, there are very few complaints.
07. Dap 18370 Self-Leveling Concrete Caulk For Brick
- Adhesives & Sealants
- Country of manufacture: United States
- Manufacturer: Dap
- An advanced concrete and masonry sealant
- Specially formulated with Kwik Dry technology allowing it to be exposed to water and moisture after only three hours without washing out
Do you want the most effective sealant to repair those cracks in your driveway? You sure want to try the Dap 18370 Concrete Sealant.
This is a specialized sealant meant for use on concrete and other masonry purposes, with great results.
One of its special features is exceptional strength. The product is designed to withstand pressure from vehicle and foot traffic without breaking apart or shrinking. That’s why so many people use it on driveways.
Another amazing feature is the water resisting capability. The product is formulated specially with an innovative process called Kwik Dry. This makes it 100% waterproof.
It’s the kind of product you can rely on to keep those cracks and holes in your driveway or sidewalk totally sealed even during the rainy season.
Mold and mildew are some of the elements that weaken sealants, making them ineffective. You don’t have to worry about them when using this caulk. It’s highly resistant to both elements.
This is one of the fastest-curing sealing products in the market. In just three hours, it’s all dry and cured, and you can walk or drive over the sealed areas without the risk of ruining the application.
It is paintable, and you don’t have to wait too long to paint the application. It’s a short, one-hour waiting duration, after which you can go ahead and apply the paint.
Some users have pointed out that the product is prone to staining over time. On the brighter side, you can rectify that by going over the application lightly with a fresh layer.
Staining can also be prevented by allowing the product to cure well for a few hours.
The Dap 18370 Concrete Sealant is strong, flexible, and durable. It’s also waterproof, and its odor is only faint. You’ll be happy you got it, so go ahead and check it out before stocks run out.
08. GE All Purpose Sealant Caulk (10.1 Ounce)
- 100% WEATHERPROOF: This 100% silicone formula offers protection from water damage, providing a reliable seal in areas prone to weather and water exposure
- 7-YEAR MOLD-FREE PRODUCT PROTECTION: Protects against stain-causing mold and mildew growth
- EXCELLENT FLEXIBILITY & STRONG ADHESION: Provides a flexible, durable seal for both exterior and interior projects
- SAME-DAY RAIN-READY: Ready for rain exposure in as little as 12 hours
- FREEZE & SUN-PROOF: Resists freezing temperatures and UV degradation for a permanently flexible seal
Are you on a budget and you need a top quality Exterior Caulk? You got to try the GE All Purpose Caulk.
This is a multi-purpose sealing product that you can use on windows, doors, pipes, and wire, vents, sidings, and other parts of your house. What’s more, you can use it both interiorly and exteriorly.
The product adheres beautifully, providing you with a lasting seal that will stay on for years. As it adheres to almost anything, the caulk is a great choice when you’re not sure what sealant will work.
When the product comes out of the bottle, it releases a faint odor. It’s advisable to wear a mask as the odor isn’t very safe for your health. On the upside, once the product dries, it is totally odorless and poses no health risk.
Drying takes just 30 minutes while curing takes around 12 hours. When it has cured, the product is completely resistant to water.
The cured product is a powerful watertight seal that keeps the water out.
Mold and mildew tend to stain caulk applications. Fortunately for you, this product is enhanced with anti-mold and mildew properties. You never have to worry about staining.
UV rays and freezing temperatures are some of the conditions that lead to caulking deterioration. This product is treated to resist these conditions. It, thus, doesn’t crack or shrink any time soon.
The GE All Purpose Caulk is sticky and thick, and thus hard to work with. But for a price of 5 bucks, it’s a pretty good buy.
Getting a strong, flexible, water and mold resistant caulk that is also durable for such a low price is a great opportunity, so if you’re on a budget, go for it.
09. Dap 18275 DYNAFLEX 230 Premium Elastomeric Interior and Exterior (10.1-ounce)
- Stays flexible
- Silicone performance
- The upc of the product is 070798183063
- Provides a permanently flexible, crack proof seal that is ideal for sealing out water and air leaks to improve the energy efficiency of a home.
- Also seals out insects from entering through small gaps and cracks.
One thing with a good silicone caulk like the Dap 18275 DYNAFLEX 230 is that it never loses flexibility. Hence, it’s the kind of sealant you want to use when you don’t want any cracks to form.
Most silicone caulks cannot be painted, but this one is different. It dries to a nice paintable finish, allowing you to blend the painted surface with the surrounding parts.
For those of you looking to seal wide gaps, this product will be very helpful. It works for gaps that are up to one inch wide, and the coolest part is that there’s no shrinking or cracking.
Most sealants out there are formulated such that you have to maintain the protection by reapplying the product after a few years. This sealant is different.
It grips the surface powerfully, forming a durable bond that will hold on for 50 years or more.
If you apply the product correctly, according to the instructions, you won’t have to worry about leaks or reapply the product for 50 years.
One of the determinants of best exterior caulk is the resistance to mold and mildew, and this product has that. That’s one of the features that give it its longevity. It also keeps the application from getting discolored.
There’s one downside with this exterior caulk. Its water resistance isn’t very strong. It sure can handle low amounts of moisture, but it’s probably not the product you want to use on an area that receives direct rainfall.
Other than that, you’ll enjoy the strong adhesiveness, stretch, and flexibility of this product.
10. Gorilla Paintable Silicone Sealant Caulk, Waterproof and Mold & Mildew Resistant
- Gorilla Paintable Silicone Sealant provides a strong waterproof seal great for window, door, trim, siding, gutters and more!
- Paintable in 30 minutes and water ready in just 15 minute
- Gorilla Paintable Silicone Sealant resists mold and mildew and is shrink and crack proof creating a long lasting seal
- Indoor/Outdoor - All Weather
- Great for: Kitchen, Bath, Window, Door, Plumbing, Gutters, Auto, Marine and more!
How would you like to get a caulk that is paint-ready in just 30 minutes and that won’t yellow or shrink? That’s exactly what you get with the Gorilla Silicone Caulk.
This is one of the fastest drying caulk sealants. It dries to a waterproof barrier in just 15 minutes. Yep, in just 15 minutes, the application is ready to take on rain or shower water without the risk or washing off.
Then, in the next 15 minutes, the application is ready for painting. It’s best to use acrylic or latex paint on this product.
If you live in an area where the temperature fluctuates widely through the seasons, then you need a sealant that can handle a wide temperature range.
The Gorilla Silicone Caulk is extremely tolerant to temperature variations. It operates well in temperatures between -40 and 170 °F.
Whether it’s winter or summer, the product remains tightly attached to the gap, providing the reliable, weatherproof protection you need.
Another joy of using this product is that it’s incredibly easy to apply. It comes with a relatively fine tip, allowing you to make the application precisely. The fine tip reduces spillage.
Because of the design, the product can be used with the standard caulk gun without any problem.
As some folks have stated, the tip is a little hard to cut off. You need a sharp knife.
Apart from that issue, the product works great, and the application lasts many years. So, go ahead and check out its other features on Amazon.
11. GE5020 Exterior Caulk For Brick (10.1-Ounce)
- 3-hour rain-ready
- Typical uses: Sidewalks, driveways, patios, masonry, steps, foundations (above ground) and tuck/repointing masonry
- Adheres To: Most Concrete, Granite, Brick, Slate, Ceramic Tile, Asphalt and Wood
- Why 100% Silicone? Unlike Acrylic, Silicone Is Permanently: Waterproof, Flexible, Shrink-/Crack-Proof
For the budget-minded buyer who wants an inexpensive concrete caulk with permanent sealing properties, the GE5020 Concrete Silicone II is the best exterior caulk for you.
This is a versatile caulking product that will work on your driveway, sidewalk, patio, and basically any structure that is made of concrete.
But it’s not made for just concrete. If you have cracks or gaps on your brick, granite, asphalt, ceramic tiles, or even wood, this is just the product you need to seal them up.
If rain is in the forecast, you might be worried about using any sealing product outdoors. You might even have to cancel your caulking project. But not if you’re using this GE caulk.
It is a fast-drying sealant, becoming rain ready in just half an hour. You’re guaranteed that after just 30 minutes, the application will not wash off.
Some caulks require up to a whole day to become water ready, but this one is different. Its fast drying property, as well as superior strength and adhesion, allows it to remain firmly attached to the surfaces.
Your home’s exteriors are exposed to harsh elements throughout the year. Rain threatening to wash off your caulk sealants and the blazing sun and the freezing ice trying to form cracks.
Luckily for you, the GE5020 Concrete Silicone II is designed to be weatherproof. It tolerates both high and low temperatures, keeping intact through the seasons.
Its permanent flexibility ensures it never cracks and the waterproof properties prevent break-down by water.
Since the exterior caulk is a bit thin, you might have to apply two layers, meaning you’ll use a little more than you’d use with other caulks. But that’s not a deal breaker considering to awesome effectiveness and longevity.
12. GE GE5050 Silicone 2+ Metal Sealant Caulk
- 100% WATERPROOF & WEATHERPROOF: 100% silicone formula offers excellent protection from water damage, providing a reliable seal in areas prone to consistent water and weather exposure
- 10-YEAR MOLD-FREE PRODUCT PROTECTION: Protects against stain-causing mold and mildew growth
- FAST CURE & TACK-FREE TIME: Offers 30-minute tack-free time and full cure within 24 hours to keep projects on schedule
- EXCELLENT FLEXIBILITY & STRONG ADHESION: Provides a flexible, durable and long- lasting seal
- FREEZE & SUN-PROOF: Resists freezing temperatures and UV degradation for a permanently flexible seal
Rainwater leaking through your metal roof? The GE GE5050 Silicone 2+ is just the answer you’re looking for.
This is an inexpensive, versatile sealant that has a wide range of applications. You can use it on metal roofs, RVs, trailer, pipes, gutters, and more.
Its adhesive properties are very strong, allowing it to hold onto a broad range of materials including vinyl, graphite, stucco, plastic, brick, glass, wood, and more.
With such versatility, the possibilities are endless.
As a good, 100% silicone material, the sealant remains flexible for life. This flexibility enables it to keep the gap sealed regardless of the movements of the house.
Whether the gap extends or constricts, the sealant moves with it. This is key in avoiding cracks and shrinkage.
This is not one of those products that you have to give 24 hours to dry. In just about 30 minutes, the job is all dry and ready for moisture exposure.
Are you living in an area with extreme weather conditions? Don’t let that stop you from sealing up those gaps in your house, RV or driveway.
The GE GE5050 Silicone 2+ is formulated for extreme weather conditions. It is waterproof and UV-proof, and it’s resistant to the freezing temperatures.
In the event of snow or heavy rains, the GE 2+ sealant, unlike many other brands, will not go loose. It holds on tightly.
When the product dries, it forms a beautiful metallic gray finish. The problem is that there aren’t other finish options, but again, you can paint the color you want.
13. Dap 00005 Phenoseal White Vinyl Adhesive Caulk (10-ounce)
- This product adds a great value
- Purpose of use for caulk & sealants, adhesive-caulk
- Manufactured in the United States
- For indoor and outdoor use on kitchen, bath, windows, doors, siding and trim
- Cured caulk is mildew resistant, and paintable
If you’re looking for the Top quality exterior caulk for windows, you might want to check out the Dap 00005 Phenoseal exterior Caulk.
With its powerful adhesiveness, the product is perfect for cracks and spaces around the windows and tubs. It creates a really strong seal that resists water strongly. No water passes through.
If you’re a beginner in the caulking space, you might want to use a product that gives you a window for rectifying mistakes.
The Dap 00005 is one such product. Rather than drying immediately, it takes time, providing you with room to clean the product off the unwanted parts.
Clean up is a breeze with a sponge and some water.
The job takes a few hours to dry into a whitish finish. If the color doesn’t go well with the surrounding area, not worry; you can paint over the application.
One of the reasons as to why this exterior caulk made it to the list is its versatility. The product adheres well to a wide assortment of materials, meaning you can use it for just about any project.
So, whether you’re working on the bathroom, gutters, garage, or any part of your home, the product will work, most likely.
Mold and mildew resistance is the other amazing benefit of getting this product. This feature protects the job from discoloration and supports longevity.
The Dap 00005 Phenoseal Caulk takes a long time to cure – at least 24 hours. But that’s not a reason enough to stop you from enjoying the low price, wonderful performance, and long-lasting protection that it has to offer.
14. Colorfast Tile & Grout Caulk
- Siliconized acrylic latex caulk formula; Water clean-up
- 10.3 oz tube for standard caulk gun
- Covers approx. 25 lineal feet at a 14 bead; Full cure 3 5 days
- Interior or exterior application; Made in the USA
- Interior or exterior application; Made in the USA
Is your grout coming off and you want the finest product to seal the spaces? Use the Colorfast Tile & Grout Caulk.
This is a specialty caulking product meant for tiles and grout, with some pretty impressive results.
Just scrape out the old grout and apply this product. But what makes it so special?
First, the product is a silicone acrylic-latex formula. That’s a powerful combination that offers you lifetime flexibility.
What does that mean? It simply means that this is not one of those sealants that will crack when exposed to the hot sun or the freezing ice. It moves with the movements of the gap and remains intact for decades.
Another awesome benefit of this exterior caulk is that it is water-clean. So, if there are parts that you’ve accidentally smeared during the application, all you need is some water and a rag to get it off before it dries.
Hate sealants that smell? You will find this one quite appropriate. It has a very faint odor, making it ideal for indoor spaces that don’t have very good ventilation. Once the product is dry, even that faint smell is totally gone.
We bet you will love the Colorfast Tile & Grout Caulk’s assortment of finish colors. There are 14 color options for the finish, ranging from antique white and champagne to summer wheat and mobe pearl.
With such a range of color choices, finding one that goes well with your surface isn’t a hassle.
This exterior caulk might be a little costlier than other products but for all the benefits it offers, we’d say it’s one of the best anyone can get.
It’s flexible, stretchy and sticky, resistant to water, mold, and mildew, and above all that, it meets the ASTM quality standards.
Exterior Caulk in-depth Buying Guide For Beginners
There are numerous types and brands of exterior caulk. While that maybe a good thing, offering you a wide range of options to choose from, it makes selecting the best exterior caulk for the job a little bit of a hassle.
Here are a couple of factors to consider when purchasing your exterior caulk to ensure you get the right product.
Caulking products are manufactured using different materials. Knowing the right material is essential, as different materials offer different benefits/drawbacks.
For instance, caulks made of silicone are more flexible than those made of acrylic latex. On the other hand, acrylic-latex holds paint better.
There are 3 main types of caulks based on the material – silicone caulk, acrylic latex caulk, and polyurethane caulk.
Water resistance is a vital factor, especially when talking about outdoor caulk. Get caulk that will not be washed off by rainwater or disintegrated by moisture or dew.
A 100% waterproof rating is always a good sign.
This is a matter of personal preference. If you’re looking to paint over the caulked surface, then go for a product that is explicitly described as paintable.
Keep in mind that generally, silicone caulks aren’t paintable. Acrylic latex caulks on the other hand normally holds paint excellently.
Ease of cleaning
Some caulking products are cleanable with water before drying while others are not. If you’re a beginner, it’s wiser to go for something that gives you at least 10 minutes or so to clean it if need be.
Keep in mind that some exterior caulks can be cleaned with water while some need special products like rubbing alcohol.
Resistance to mold and mildew
Mold and mildew can destroy your application by staining it and causing it to disintegrate faster than you’d like. That’s why it’s essential to get an exterior caulk that is resistant to these elements.
The odor coming from a caulking product might be toxic. And even if it’s not, who wants the discomfort it presents? Go for an exterior caulk that releases little to no odor.
Types of Exterior Caulk
As mentioned before, choosing the right exterior caulk depends on picking the correct type. Caulks are classified based on the material they’re made from as demonstrated below.
In the world of caulks, acrylic latex is the workhorse. That’s because it’s extremely versatile and applicable to many places. It’s also super easy to use.
Acrylic latex bonds well on virtually all materials including:
These days, there are some upgraded models that contain some silicone to offer the advantages of both silicone and acrylic latex. Such models offer exceptional flexibility that never fails.
There are also some hybrid varieties enhanced with polyurethane, and these offer excellent adhesiveness, paintability, and lifetime flexibility.
Acrylic latex also enjoys the ease of cleaning with water and the absence of odors.
Where to use it – exteriorly and interiorly on:
The main perk of buying 100% silicone is that it’s flexible for life and it resists mildew superbly.
On the flip side, however, silicone caulks are generally not paintable. They don’t hold paint very well.
But if you need something that assures you of no cracks at all, then 100% silicone caulks are the ones to get.
They’re also resistant to water, making them ideal for those wet areas both interiorly and exteriorly.
Note: most people prefer this caulk for indoor use. The inability to be painted over makes it a little unsuitable for outdoor use. That said, you can get one with a finish color that matches your surface.
Where to use it:
Basically, any part that’s exposed to water.
Concrete & Masonry Specialty Caulk
This is a specialty caulk that is formulated specifically to seal gaps in concrete. It’s more effective than general-purpose types.
Masonry specialty caulk is usually enhanced with urethane to boost the adhesion. Its special formulation enables it to keep the water out while giving it the strength to withstand foot or vehicle traffic.
Where to use it:
Best Exterior Caulk Brands For Brick, Windows, Door on The Market
There are countless caulking products out there, and sifting through them to find those that perform well and last long can be a bit of a hassle.
To make your work simpler, we’ve compiled a list of brands that you can trust. These are the most popular, most trusted brands in the exterior caulk arena.
DAP’s story goes back to the 1860s when two young inventors and entrepreneurs named Elmer and Robert began making sealing wax from a small garage in Ohio.
These were the pioneers, and they set the foundations for the long succeeding line of inventors and sales reps to avail some of the finest sealant product in the US and beyond.
The company uses some of the most innovative tech and materials such as polyurethane and fast-curing high-strength adhesive gel to create caulk that you can rely on.
Sashco traces its roots to the 1930s when a visionary inventor named Donald Burch set out to create an inexpensive yet effective window putty that was also non-messy.
His invention came at a time when the economy was on a decline and it, thus, helped lots of poor people in Colorado and the surrounding states.
By 1941, Donald had added caulking to his line of products. Though the inventor is long gone, the caulking is still of superb quality, and many people around the world continue to use it.
The Red Devil brand was founded in New Hampshire as the Smith & Hemenway Company in the 1870s. The objective of the founders was to avail reliable everyday tools for DIYers and professionals. By the 1900s, the brand was already synonymous with quality among these groups of people.
Today, the Oklahoma-based Red Devils company is one of the top manufacturers and sellers of quality hand tools and chemicals (including caulks), especially for home improvement projects. I have also reviewed a good exterior caulk from this brand.
For nearly 100 years now, White Lightning has been one of the marketing leading producers and sellers of quality caulks and sealants in the world.
This Cleveland-based firm specializes in caulks and sealants for kitchens, baths, windows, and doors.
The Cincinnati-based Gorilla Glue Company has been producing and selling sealants, caulks, and other adhesive products for more than 20 years.
With over 5 trademarks and a huge team of workers, Gorilla is undoubtedly one of the key players in the caulking stage. Their products are known to be versatile, effective, and long lasting.
Where You Can Use Exterior Caulks?
When used outdoors, caulking serves two main purposes. Firstly, to keep the water out, so it doesn’t get into the gap and cause deterioration of the structure.
Secondly, to restore the structure’s aesthetics/beauty.
Here are some exterior areas/structures that might need caulking:
How to Make Exterior Caulk Long Lasting
Unlike interior caulking, outdoor caulking has to deal with all the extremes that nature dishes out. That’s why it needs additional attention.
The following are ways in which you can make your outdoor caulking stronger and help it last longer.
Use a primer
Wood and wood-based items don’t always offer a good surface for the caulk to adhere. So, consider priming these surfaces first then apply the caulk.
Try working the primer onto the surfaces to help them hold the caulk.
Clean the surface before caulking
Caulk is an adhesive. One thing about adhesives is that they don’t stick well to a dirty surface.
Before caulking, be sure to clean out the dirt, loose paint, and any other debris that’s on the surface where you want to apply the caulk.
You might need a brush, some towels, and water and perhaps some compressed air too.
Smooth out the application
Smoothing or rather tooling the bead does two main things. Firstly, it gives the bead a better appearance. And secondly, it gives it a good shape, helping hold out to movement a lot better.
Depending on the size of the gap, you can either use your finger (in a latex glove) or the convex side of a plastic spoon.
The hourglass bead
Temperature and humidity changes might cause the gap to narrow or widen.
When it narrows, the caulk gets compressed, and that’s not much of a problem. But when it widens, then the caulk might tear in half or get pulled away.
To prevent that from happening, consider creating hourglass beads. Being narrow in the middle, the beads will stretch more easily, and being thicker on the edges, they’ll stick resiliently.
Self-leveling concrete caulk and backer rod
When sealing gaps and cracks on concrete, one of boosting the caulk’s longevity is to apply some backer rod first.
Using self-leveling caulk helps avoid the mess/extra work of tooling.
Remember, backer rods should only be used for gaps that are ¼ inch or wider.
Tips for Caulking Properly
Frequently Asked Questions (FAQs)
Q1. What is caulk?
Caulk is an adhesive material used for sealing gaps, seams, and joints in building structures. It’s purpose is to form an insulating or waterproof seal, for instance between a tile and a tub.
Q2. From which ingredients these caulks are made of?
Most of them are built from silicone, latex, acrylic or the combination/mixture of these 3 elements.
Q3. Where are caulks used?
You can apply caulking in a gap where water or air could seep through, for instance between a door or window frame and the surrounding wall.
What sort of caulk is best for the bathroom?
Bathrooms are exposed to moisture, and thus the most appropriate caulk for them is one that is totally waterproof. Look for silicone or siliconized caulk that is resistant to moisture, mold, and mildew will work excellently.
Q4. What are the various types of caulk?
There are 3 main types of caulk – acrylic latex caulk, silicone caulk, and masonry caulk, which is used for sealing gaps in concrete and stones. Siliconized acrylic latex caulk enhanced with urethane works the best in most applications.
Q5. Is caulk waterproof?
Most caulks are waterproof, though the degree of water resistant is different between different brands. Some brands are 100% waterproof and can handle large amounts of water while others can only handle a little moisture.
Q6. Do I need a gun to apply caulking?
A caulking gun is essential as it makes the work easier and improves the precision, but it’s not necessary. If your exterior caulk is contained in a squeezable tube, you don’t need a gun to apply it.
Q7. Is exterior caulking usable in the bathroom?
Exterior caulk is formulated to deal with the harsh elements of nature including moisture, mold, and mildew. Exterior caulk, therefore, can be used indoors and even in the bathroom. In contrast, interior caulks can’t be used outdoors.
Q8. Can I use caulk to seal cracks on my driveway?
Sure. But instead of using a general-purpose caulk, go for a specialty caulk labelled “for concrete and masonry” as it’s designed to bear the heavy foot and vehicle traffic. Also you can use it on brick.
So, which one did you select as the best exterior caulk? Made a decision yet?
Remember, the main features to look for are water, mold, and mildew resistance as well as the ability to adhere to surfaces and flexibility to prevent cracking.
These are some of the factors that formed our criteria when looking for outdoor caulks that will serve you well.
If you’ve settled on a product on our review, go ahead and click its link to check it out on Amazon.
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Last Updated on July 17th, 2021