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Top 10 Best Exterior Caulk Reviews in 2021 (Recommended!)

Caulks, exterior or interior - are not something we deal with every day. There are a lot of people out there who don’t even know their existence, never mind their importance in our lives!

However, it is the homeowners, construction workers, repairmen, and engineers who know just how important caulks are to the wellbeing and maintenance of a building.

A simple but powerful ingredient in construction that can contribute to the conservation of your home, office, shop or any other kind of building.

If you are reading this article without any previous knowledge about exterior caulks, you’ve certainly come to the right place.

Here we’ll discuss everything you need to know about the best exterior caulk - what they are, how they are used, what are the best exterior caulks you can get at a reasonable price, as well as what you should remember when buying exterior caulk.

It’s all here for you in one place! If you don't have enough time to dive deep, then have a quick look to our top 3 picks

What is Exterior Caulk?

For everyone who has no idea about what exterior caulks are, they are a kind of sealants to use on the cracks and gaps around your home after construction.

Exterior Caulks are different than the ones used inside the home, they are used mostly outside and are stronger.

You can use exterior caulk in not only on gaps and holes in cement in your floors and walls, but also on pipes, window sills, doors, wooden floors, exterior tiles, and decorative ceiling installations.

So, where, and why, do we use exterior caulk?

The main object of applying exterior caulk is to completely seal off your home from the outside world.

No matter how secure you make your home, there are going to be miniature holes and gaps everywhere around the house, the ones you cannot fill up with cement or a wooden board.

These gaps are mostly found around window sills and door panels, but also in the plumbing regions, allowing air, water and sometimes, bugs to get into a building.

This is where exterior caulk comes in handy, to completely seal off your home from all kinds of weather-related and environmental factors.

Most exterior caulk is made from latex or silicon, or a combination of both. They come in a rather large tube, or in a cartridge with an applicator. exterior caulk is quite easy to apply, even for a layman, but this is usually done by a professional after construction work is complete on a building.

Exterior caulk needs to be applied before the final finishing coat of paint or polish, so that they can harden and become invisible to the eye.

After the final painting or polishing layer, you can’t even see where the exterior caulk has been applied to your walls, windows or door panels, because they blend in perfectly with whatever surface you’ve used it on.

Buying the perfect exterior caulk can be a little tough if you don’t exactly know what to look for.

This is a job best suited for the professionals - engineers, landscape artists, interior decorators, plumbers and electrical engineers, stylists and construction workers - as they are the ones associated with working with exterior caulk.

However, if you are handy with simple repairs around the house or if the job is too menial to call in a professional, you can do the whole thing for yourself, but you are going to need an easy-to-use and effective exterior caulk for that.

Here in this article, you will know what to look for in the right exterior caulk for the right occasion, as well as how to use them.

Best Exterior Caulk: Reviews 2021

Although there are different kinds of exterior caulk available in the market for different kinds of surfaces and uses, here are the ten best exterior caulk that you can choose from.

1. Sashco Big Stretch Acrylic Latex High-Performance Caulking Sealant


This 10.5-ounce latex exterior caulk comes in a cartridge, easy to use by everyone, even if you have never used caulk or any kind of sealant before.

However, it will also give you a permanent and professional-grade seal anywhere you use this caulk.

Once applied, this flexible but sturdy exterior caulk will harden and become absolutely permanent, sealing off your home from any kind of exterior nuisances, so that you won’t have to apply caulk again. At least, not for several more years.

There’s nothing more annoying than recurring repair jobs around the house when you have to keep applying a sealant or exterior caulk to the same spot again and again.

However, if you use the Sashco Big Stretch on your holes and gaps around the house, you can be absolutely sure that you won’t have to pay attention to that same problem for several years in the future.

This is not only a permanent sealant but weatherproof. It will keep humidity, water and cold air out of your homes when your windows and doors are closed.

You can manipulate the Sashco Big Stretch Latex Caulk any way you want to, by twisting, bending, compressing, stretching and elongating it.

It can be increased to more than 500% of its original size when needed, and will instantly harden on any surface, giving you immediate results.


  • Available in 10.5-ounce cartridges
  • Permanent and professional-grade
  • Weatherproof and waterproof
  • Effectively seals of water, air, and humidity
  • Can be used on any surface
  • Can be increased up to 500% of its original size
  • Can be stretched, twisted, elongated and bended
  • Guaranteed not to crack or become brittle over time
  • Long-lasting effects for years
  • Powerful adhesion

This is a slate gray adhesive sealant that is both flexible and permanent. Available in a 10.1-ounce cartridge, the DAP 18110 is easy to use, even if you have never done anything similar before.

A single application adds a great value to your construction or design, effectively sealing off your home, office or shop to the outside weather. It can withstand anything, from harsh weather to extreme heat.

The DAP 18110 Acrylic Latex Caulk takes only half an hour to harden, after which you can add any kind of paint or polish over it.

You can use this sealant anywhere and on any kind of surface, from cement to wood, metal to plywood.

The sealant is completely resistant to moisture and mildew of any kind; this means no matter how exposed it is to weather and external conditions, this sealant will not come off or be damaged.

If ever dirty or dusty, you can easily clean up the sealant with water, which will also not damage the sealant in any way.

This is a premium quality latex sealant caulk that will give you years and years of steady performance once you use it, and you’ll not have to worry about the problems at hand for many years.


  • Premium quality sealant
  • Weather- and water-resistant
  • Resistant to mildew and moisture
  • Can be painted on and polished
  • Can be used both inside and outside the home
  • Can be cleaned up with water
  • Made from latex silicon
  • Flexible and permanent
  • 35-years durability guaranteed
  • Can be used on most surfaces

This is a pack of 12 Latex Sealant that will last you a lifetime of use. This pack is more suitable for professional construction workers, engineers and landscape artists than amateur homeowners or for repairs around the house.

Because this is a 12-pack package of sealant, this is more than enough for a lifetime of handy repairs around the house for an amateur.

Other than that, the DAP 18152 BOOOKE6IES is a permanent solution in keeping the hash weather out of your homes.

This sealant comes with a 35-year durability guarantee, which means that you won’t have to worry about making any repairs to the place you applied this sealant to for 3+ decades. You can paint on it, apply polish or use water to clean it up.

The DAP 18152 BOOOKE6IES is completely invisible to the naked eyes, so that you can use it without having to care about aesthetics.

Besides, the DAP 18152 BOOOKE6IES has an excellent adhesion that will stick to any surface: wood, cement, glass, metal and steel. You can use this sealant both inside and outside your building, as well.


  • Pack of 12 cartridges of sealant
  • 10.1-ounce cartridge
  • Made from acrylic latex and silicon
  • Highly adhesive
  • Will stick to multiple surfaces
  • 35+ years of durability guarantee
  • Can be painted on and polished
  • Can be cleaned with water
  • Invisible to the eye and hardens instantly
  • Weather- and water-resistant
  • Can be used both inside and outside

This sealant from Red Devil has been specially made for doors and windows, a 5-ounce cartridge that is extremely easy to use.

Red devil has separate sealants for different parts of the house, and the 0408 EZ Squeeze is perfect for putting in the final touches on your door and window frames.

This caulk is easy to use, with a special EZ Squeeze cartridge that allows you to use up every single blob without any waste.

You can seal your home from every bit of rain, air, draft or moisture by effectively sealing off your windows and doors with this caulk.

Perfect for use both inside and outside the home, the Red Devil 0804 EZ Squeeze can be painted on after it has dried up almost immediately.

This is a weather-, water- and mildew-resistant sealant that you can just use once and forget about for decades to come.

This caulk sealant is absolutely perfect for sealing off any cracks or gaps in your doors and windows, covered up by paint or polish. You can go on winding up the tube until you have absolutely nothing else left in the tube.


  • Specially made for doors and windows
  • 5-ounce cartridge
  • Weather- and water-resistant
  • Can seal off water, rain, moisture and air
  • Mildew-resistant
  • Will harden immediately
  • Single layer will give you decades of protection
  • EZ Squeeze option will make sure every drop of sealant is used

This funny looking 2.8-ounce squeeze tube contains an incredibly versatile sealant that you can use almost anywhere, both inside and outside the house.

This sealant is made from 100% silicone that will stick to tiles, glass, cement, wood and metal, and many more different kinds of surfaces, almost every ingredient that is used in construction.

This sealant caulk is 100% water- and weatherproof, and will completely seal off your home, store, business and office from any outside intrusion of water, cold/hot air or moisture.

You can apply this caulk to your windows and doors, as well as any kind of gaps and cracks around the home, and be completely safe from outside intrusion.

Besides doors, windows and walls, you can use the Gorilla 100 Percent Silicone Sealant Caulk in your kitchens and bathrooms around pipes and faucets, and in your gutters and drains.

This sealant comes in handy while working with your automobile engines and in swimming pools and aquariums.

In short, this is a very versatile sealant that you can use almost everywhere and for different purposes. It won’t become yellow, shrink or even crack, even when exposed to water or harsh climate for a long time, and this sealant will completely resist mildew and mold of any type.


  • 2.8-ounce sealant tube
  • Can be easily squeezed to extract sealant
  • Can be used on wood, tiles, brick, cement and metal
  • Can be used both inside and outside the home
  • 100% weather- and waterproof
  • Can be used in gutters, drains and pipes
  • Can be used in automobile engines
  • Completely resistant to mold and mildew
  • Doesn’t yellow, shrink or crack
  • Can be used both inside and outside

This sealant caulk from Sashco - the Sashco 13010 - can stick to wet surfaces as well as dry ones. This means that you can use this caulk in pipes and plumbing jobs, and it can be trusted to keep water out of places you don’t want water to reach.

Besides, this sealant can also be used both indoors and outdoors, to keep your home, office or storage building completely sealed off from wind, hot/cold air, water and moisture.

This is a 10.5-ounce pack that will last you years and years of repairs around the house. Made from a co-polymer rubber-based sealant, Sashco 13010 is flexible and soft. You can extend it, twist it and even bend it, and there will be no tear in the sealant.

Since you can use this sealant on wet surfaces and underwater, this is the perfect caulk to be used for repairs in your swimming pool, aquariums and inflatable pools. Even immersed under water, this sealant will maintain its adhesion to surfaces.

This is a clear adhesive sealant that you can also paint on, or cover with plastic for aesthetic purposes.


  • 10.5-ounce cartridge
  • Clear and can be painted on
  • Works both outside and inside the house
  • Works on wet surfaces
  • Work as a good adhesive under water or when immersed in water
  • Perfect for aquariums, swimming pools and inflatable pools
  • Perfectly seals off air, water and moisture
  • Made from rubber-based co-polymer
  • Flexible and soft
  • Can be bended, twisted and extended

This highly durable caulk sealant from GE Silicon comes in a 10.1-ounce cartridge and is extremely easy to apply.

The main points of entry for unwanted cold/hot air, moisture and water in our homes and offices are through the gaps in our windows and doors. 

This sealant has been manufactured especially for sealing off doors and windows so that our buildings are completely weather- and water-proof.

With this caulk sealant in the gaps between door panels and window panes, you can be sure no single drop of water or any draft of air can enter your rooms.

You can use the GE Silicon caulk anywhere in your home, office, shop or storage unit - from the attic to the basement. It can be used on all types of windows and doors, as well as on brick and mortar.

This sealant hardens in less than 30 minutes, after which, you can apply paint or polish on it, or even wash it with water. Your rooms will become completely sealed off from the harsh weather outside in less than half an hour.

Once hardened, you won’t have to worry about any kind of repairs on these doors and windows for the next 10+ years.

You can make small repairs to your home with the GE Silicone 2+ Window and Door caulk, and completely put the matter out of your mind!


  • Comes in a 10.1-ounce cartridge
  • Mainly for doors and windows
  • Hardens and becomes permanent in 30 minutes
  • Can be painted on and washed
  • Seals off water, air and moisture
  • Can be used on bricks and mortar
  • 10+ years durability guarantee

This is a rather small 5.5-ounce cartridge that comes quite in handy for small and simple repairs around the house.

You can use this acrylic latex caulk on almost any kind of surface in the house; from wood to cement, metal to plumbing pipes. You can paint on this sealant after it hardens, both inside and outside the home.

With this acrylic sealant, you can seal off your home, office, store or storage unit from any kind of outside wind, air, water and moisture.

It is weather-, water- and mildew-resistant, and will last for years. In fact, one application gives you 35-years of durability guarantee, like any other DAP product.

This caulk is white in color and hardens very quickly. It is a good adhesive that will stick to most material, made in the United States. You can also clean it up with water in case of dirt build-up.


  • Comes in a 5.5-ounce cartridge
  • Acrylic-based latex sealant
  • Weather-, water- and mildew-resistant
  • 35-years of durability guarantee
  • Can be painted on and washed with water
  • Can be used on most surfaces
  • White in color
  • Hardens within minutes and becomes permanent

This sealant caulk from GE Silicone can be trusted to permanently seal off harsh weather and hostile environment from your home, by sealing off any gaps and cracks in your doors, windows, floors, walls and ceilings.

Any gaps that you apply this sealant will be completely sealed off, with no cracks or shrinks in between. Even under extreme weather, nothing will happen to the sealant after it has hardened.

This sealant hardens within 30 minutes of application, and can be painted on or washed with water. Once hardened properly, it can withstand more than 12 hours of continuous exposure to water or weather.

This means that you can use this sealant for inside the building as well as outside, where exposure will be the most.

The GE Silicone I All Purpose Caulk can be used on any kind of surface around the house, including door frames and window sills, sidings and trimmings, vents, pipes and wires.

It is made from 100% silicone and is completely water-proof and 100% weatherproof. This sealant is flexible and stretchable; it will stretch and move when needed with the surface it is used on.


  • Made from 100% Silicone
  • Can be used on any surface inside and outside the room
  • Can be painted on or washed with water
  • Hardens within 30 minutes of application
  • Can withstand more than 12 hours of water and harsh weather
  • Can be used in plumbing pipes
  • 100% waterproof and weatherproof
  • Flexible and can be stretched

This is a clear, high-performance acrylic latex sealant that will give you a lifetime of durability. This is the perfect sealant for sealing off moisture and mildew from your home, as guaranteed by the HomeShield Antimicrobial Protection.

The Red Devil 0777 can be used on most surfaces around the house, including cement, wood, glass, plaster, masonry, aluminum, brick, metal, concrete and tiles. You can use this sealant on your doors and windows, as well as walls, floors, ceilings and pipes.

You can depend on the Red Devil 0777 sealant for a lifetime of durability wherever you use it, not just years or decades.

Indoors or outdoors, it can withstand the harshest of weather forever, and keep your home safe from cold air and water. This sealant is a great way to make sure no moisture comes into your home and create humidity inside.

This sealant from Red Devil takes a very little time to harden, and can be painted on. You can also wash it with water when it gets dirty, or when you are washing your doors and windows, and nothing will happen to your sealant.

It doesn’t shrink or crack when exposed to extreme heat or washed with water, either. This 10.1-ounce cartridge will last you years of repair work around the house.


  • 10.1-ounce cartridge
  • Permanent repair solution around the house
  • Lifetime durability guarantee
  • Can be used on most surfaces in the house
  • Hardens very quickly
  • Can be painted on and washed with water
  • Can be used both indoors and outdoors
  • Clear and flexible
  • Won’t crack or shrink with time and exposure

Things To Consider Before Buying an exterior caulk

Sealants, or caulks, are small things that you need to keep around the house for small repairs you don’t want to call a professional for.

You might think you don’t have to think a lot about the features and qualities of Exterior caulk, but it’s not exactly correct. A cartridge of external caulk might be a small thing, but it is quite an important one for repairs when you need it.

The right Exterior Caulk can save you a lot of trouble around the house when it is time for repairs. If you get the right one, a single cartridge can be a priceless help in times of need.

Here are some of the key features you should look for in an Exterior Caulk or Sealant.

1. Durability Guarantee

Some sealants can give you a few years of durability guarantee, while others give you a guarantee for the next few decades. With sealants, you just want to apply over a gap or a crack and forget about the whole thing for the next few decades.

You want the sealant with the most durability since you want to completely forget about the repair you have just completed around your house for as long as it is possible.

If you have to keep on applying caulk to the same place again and again every few weeks, there is no use investing in a good caulk.

Therefore, while choosing an Exterior caulk, it is quite important that you get one that guarantees the longest durability.

While caulks from GE Silicone gives you 10+ years of durability guarantee and caulks from DAP gives you 35+ years of durability guarantee, the RED DEVIL 0777 gives you the highest: a lifetime of durability.

2. Versatility

While some Exterior caulks are only manufactured for doors and windows, others can be used on literally any surface around the house.

The former ones are fine if most of your problems lie with door frames and window sills; however, for an overall checkup and repair of your home, office or storage unit, you need a more versatile product that can be used everywhere: on the walls, floors, ceilings, pipes, as well as on the doors and windows.

The most versatile Exterior caulks available in the market can be used everywhere and on every kind of surface you can find inside a building, from tiles and cement to metal, crown molding, wood, glass, masonry, plaster, brick and mortar, aluminum and concrete. The more versatile your Exterior caulk, the more you can do with it.

3. Time Taken to Harden

The less time it takes the Exterior Caulk to harden, the more convenient it is for you. Most caulks available in the market takes around 30 minutes to an hour to harden and become completely permanent.

The quicker the caulk sets, the easier it is for you to paint on it or add polish to it, and the quicker to forget about the whole thing.

If your Exterior caulk hardens quickly, you can forget about the whole thing the moment that you apply it to gaps and cracks, and not bother with the problem again for the next few decades.

4. Effectiveness

Most Exterior caulks are 100% resistant to water, harsh weather, moisture and mildew, since these are the factors that you need to eliminate and seal off from your home.

However, how much effective these sealants really are in keeping off water, cold wind and moisture from the insides will have to be determined after use, but they all advertise to be the same.

The main point of using an Exterior caulk in your home is to make sure no water, moisture or air enters from the various cracks and gaps in the structure, especially from the doors and windows.

Since most such sealants claim to be weather-, moisture- and water-proof, this is an important feature to look for while buying a brand.

5. Color and Texture

Exterior sealants usually come in two colors: white and transparent (clear). The clear ones blend in better with the background than the white ones.

However, all exterior caulks can be painted on or polished, so it is easy to camouflage them behind other colors.

If you have plans to apply color on your repairs, both the white and the clear Exterior caulks are fine but if you don’t plan on applying color, it is better to stick to the clear and transparent brands.

6. Other Features

There are some other features that are quite important in Exterior caulks that you should also look for, i.e.:

  • Whether they can be used both inside and outside the house/building;
  • Whether they can be washed with water;
  • Whether they can withstand direct exposure to sunlight and water for a long time (for harsh weather circumstances);
  • Whether they can stick to surfaces under water (for swimming pools and aquariums);
  • Whether they can be applied to wet surfaces (pipes);
  • Whether there is a chance for the caulk to crack or shrink over time;
  • Whether they are flexible and can be bend, twisted, or extended; etc.

As mentioned before, these exterior caulks are rather simple items to own and keep around the house, but when the need arise, they can make a world of difference to your home, your belongings, and your furniture.

So whether you are investing in a small 5.5-ounce cartridge or a 12-pack, it is always preferable to select one which will cater to your every repair need around the house.

Frequently Asked Questions (FAQs): Best Exterior Caulk 2021

1. What are Exterior Caulks made of? 

Most of the exterior caulks available in the market are made from latex, acrylic, silicone, or a mixture/combination of all three ingredients.

2. Where can I use Exterior Caulk in my home? 

If you are looking to weatherproof your home, you can apply a fine layer of exterior caulk to any gaps or cracks from where there is a small draft or water coming in.

This is usually seen in the window sills and ledges, or even doors, as well as ceilings and floors. Wooden planks as your walls can have a number of gaps in and between them, which can all be sealed off with caulk.

Besides, caulks are used to seal off gaps around ceiling fans, under the doors or between aluminum windows.

3. Is caulk poisonous or dangerous? 

Most Exterior Caulk can be a mild irritant and nothing more than that. The strong odor

when applying the caulk might be irritable to a few, but it’s nothing serious if you choose to cover your nose and mouth while applying.

If you touch caulk before it hardens and then touch your eyes, they could start to irritate a bit. Accidently eating caulk or getting a little amount in your eyes would not be a big bother for adults, especially if you wash your eyes immediately and clean your mouth.

Even in case of small children or small pets, getting a little bit in their mouth or accidently touching their eyes with caulk-infested hands can cause mild irritation. However, if they accidentally swallow a large chunk of hardened caulk, it can cause choking.

4. Which type of Exterior Caulk lasts longest and can withstand Harsh conditions? 

If you are looking for a type of Exterior Caulk for the outside that can hold strong under the harshest conditions, Acrylic-based sealants would be more preferable.

These acrylic-based caulks are also labelled as “acrylic-latex” but you can find only “Acrylic” ones, as well. They are more expensive than the other types, but they can protect your home from extreme water damage or heat.

5. Which one is the most flexible Exterior Caulk? 

When it comes to flexibility, the Exterior Caulks made from Polyurethane are the best. They are the easiest to apply, and can be bend, twisted and even elongated much more than other types.

The Polyurethane exterior caulks happen to be the most flexible ones, and they stick better to most surfaces.

These caulks are better than others when you are using them on concrete, for example, or on gaps that are wider than ¼ inches. They last longer but are more expensive.

6. Does Exterior Caulk work on Wood? 

Yes, these caulks work perfectly well on wooden planks, hardboards or natural wood. However, they work better if you can apply a coat of primer to your wood before applying the caulk. It helps the caulk stick to the wood better after a coat of primer.

The primer can be applied on the wood and in the gaps, but the gaps should not be completely filled with primer. That job rests with the Exterior caulk.

Final Words

There’s no way we can underestimate the importance of good Exterior Caulk when it comes to making repairs around the house or weather-proofing it.

With a single application, you can completely seal off your home, office, store or storage unit from water damage, cold air or even pests and bugs, and can stop the hot air inside from escaping.

When we live in a harsh environment and want to escape inside our comfortable homes, it is such exterior sealants that can guarantee that we are leaving the environment outside the moment we step inside our threshold.

The best exterior caulk, whichever one matches your need, budget and requirements, can help immensely in making your home more comfortable.

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  1. Danielle

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