Choosing the best exterior caulk is so much different from selecting an interior one. Outside, there is an exposure to high temperature from the sunshine, rainy weather, and movements of all kinds. This is different from indoors.
Check Dap 18110 Acrylic exterior latex caulk for quick purchase.
Maybe, you need to seal your automotive parts or your boat to fill gaps that would let water in. To ensure safety, you will need to look for the best caulk which will not crack or break. Also, for painting boards, you will need the sealant that will allow for painting after drying.
Consequently, you may need to fix leaking water pipes. I recommend a waterproof sealant that will withstand water all the time. For application in features that are involved in tough work all day, a tough sealant is needed. Stretching caulk would be better where flexibility is key. Some sealants are multipurpose and can be used in both exterior and interior applications.
Top 10 Best Exterior Caulk Reviews 2021
Knowing exactly what you want is great purchasing power. Below we have availed to you the best exterior caulk. All are easy to use and value for money.
Quality and durability are the features that will always give you excellent results. Next time you go to a store, write down the caulk’s name that fits your needs from this list. The storekeepers will know that an expert just recommended it for you.
1. Dap 18110 Acrylic Latex Caulk – best caulk for exterior windows and doors.
This caulk is durable and flexible hence providing support for a long. You will get a durability guarantee of 35 years. It is high quality, and you will be able to paint the applied area after just 30 minutes of application hence saving your time. This is value for money.
Suitable for exterior use due to its excellent adhesion. Also, it is good for interior use, making it multipurpose. This caulk is easy to use; hence you won’t need to pay an expert.
It comes in a slate gray color hence merges well with paints. Also, it is easy to clean with water and soap. Alternatively, you can use isopropyl alcohol to clean. It is resistant to water and mildew, making it suitable for exterior application.
- Easy to use; you won’t need a technician.
- Multipurpose; one caulk for exterior and interior
- Excellent adhesion
- Water and mildew resistant and so ideal for outdoor use.
- It is paintable hence won’t compromise your painting space.
- It comes in a slate gray color, which merges well with paints.
- Although low odor, allergic people find it uncomfortable.
- It doesn’t flow smoothly.
2. GE Sealants & Adhesives GE500 – best silicone caulk.
If you want an outdoor caulk, GE Sealants is your best option. It comes with a 100% silicon formula that will give you maximum protection from all weather conditions. This sealant can withstand alternate dry and wet conditions hence ideal for exterior use. In addition to this, it will give you 10 years of protection from stain-causing molds. This will ensure durability.
To ensure maximum support, this caulk is highly flexible and provides strong adhesion. Within 30 minutes, the bond will be strong enough to do withstand wet conditions. Therefore, you can use it while on-the-go. GE sealants can withstand temperature frustrations hence do not crack or break on contraction and expansion.
Also, they are resistant to freezing and degradation by UV rays. This factor will enable you to use it in both indoor and outdoor applications. GE sealants do not discolor metals and come with a lifetime guarantee.
- Durable; comes with a lifetime guarantee hence offering long-life support.
- Due to the silicon formula, it is ideal for all-weather use.
- Since it is crack-proof, it will withstand extreme temperatures.
- Fast-drying; only 30 minutes, and it will be raid dry.
- Resistant to freezing as well as UV ray degradation hence ideal for outdoors
- The applied spot is not printable; hence can compromise printing space.
3. Gorilla Clear 100 Percent – best silicone sealant.
This sealant is one of the toughest caulk, making it ideal for outdoor application. This is because it is made of 100% silicone. It is multipurpose so that you can use it on windows, doors, kitchen, marine plumbing, bath, and gutters. It will withstand all kinds of movement.
After just 30 minutes of exposure, the seal is hard enough to withstand water, mildew. Also, it is mold resistant. After application, it leaves a translucent clear surface that won’t yellow, crack or shrink under any conditions. You can use this caulk to seal gaps and cracks between surfaces.
- Tough silicone caulk hence good for both indoor and outdoor application.
- Fast-drying; hence you can use it on-the-go.
- You can use it for a wide range of materials and purposes.
- Water Resistant hence you can use it even on things that are exposed to all weathers.
- Will fill up cracks and gaps on surfaces.
- Compatible for use with a caulking gun.
- Easy to use as it comes with clear to understand instructions.
- It does not crack, shrink, or yellow on exposure to different weather conditions.
- Old caulk may dry up hence incurring losses.
4. GE Sealants & Adhesives- best exterior window caulk.
GE Sealants & Adhesives is an all-weather 100% proof sealant. Therefore, you can use it for both exterior and interior applications. It is durable and flexible, and with a stretch of 600%, it will seal gaps up to 2 inches apart. The sealant is shrink-proof and won’t crack in any condition.
After just an hour of application, you will be able to paint on the surface. This is because it dries with an even finish. The caulk is mildew and mold resistant; hence won’t stain after some time. This makes it ideal for exterior use, where it will be exposed to all sorts of weather conditions.
With a caulking gun, it comes out easily and smoothly; hence anyone can do it conveniently.
- All-weather use; ideal for use on outdoor features such as plumbing materials and automotive.
- Will seal gaps up to 2 inches wide due to the 600% stretchability of the caulk.
- Durable; it is value for money and will provide support for a long.
- Easy to use; no technician needed when using this sealant.
- It’s fast-drying; 1 hour after application is enough for all-weather use. It dries to a water-resistant surface.
- Paintable; the caulk surface produced is smooth and allows for painting.
- It is sometimes hard to press out the sealant.
5. Sashco Big Stretch Acrylic Latex – best exterior caulk for wood.
If you need a water-based sealant, this is the best choice. A big stretch is a high performing elastomeric caulk that will give you a very powerful adhesion and excellent elasticity. Its 500% stretch capability will fill up gaps to two inches wide without breaking or cracking.
It is great for various materials such as glass, wood, metal, anodized windows, cement, and drywall. Sashco Big Stretch is perfect for both interior and exterior use. You can rely on it to fix doors, baseboards, sound-proofing interior walls as well as vents. This caulk will handle any kind of joint movement.
It dries within 4 hours with a paintable surface. It will require between 24 and 28 hours or even more to withstand wet conditions for interior painting. However, for excellent results, I suggest you do the exterior painting after one week.
- It is water-based.
- 500% elasticity hence can support any kind of movement.
- It is paintable with most paints hence useful in fixing painting boards.
- Adheres to a wide range of materials.
- It will fill gaps that are up to 2″ apart.
- It takes relatively longer to dry.
- It May not withstand wet conditions very well.
6. DAP 18304 DYNAFLEX 230 – best exterior paintable caulk.
DAP 18304 is a highly flexible caulk that perfectly seals air and water leaks. It doesn’t crack even with extreme weather. It will also seal spaces to prevent the entry of insects and other small animals into the house. When cured, the caulk will be mildew and mold resistant. This will ensure that it won’t stain after some time.
It is multipurpose, so you will use it to seal doors, windows, baseball boards, and siding, among others. Its high power of adhesiveness facilitates this. Also, it is durable hence will provide support for a long time.
It is easy to use, so you will apply by yourself, saving the cost of hiring a technician. Generally, it is value for money. For both outdoor and indoor activities, I recommend you to use this caulk.
- Easy to use hence saving on the cost of hiring a technician.
- Highly flexible hence will withstand any movement without cracking.
- Will seal spaces; you can use it to seal spaces to avoid the invasion of insects.
- Waterproof and airproof; you can seal leaking pipes for both water and gas.
- Value for money and highly adhesive.
- The sealant may not be paintable; hence understandable for surfaces meant for painting.
7. gorilla silicone sealant caulk – 100 Percent white.
Gorilla white is a fast-drying 100 percent silicone sealant. Just 30 minutes after application, it will be ready to be exposed to water. This is because it is waterproof. Also, this sealant resists mildew and mold. Gorilla sealant is clear and will not yellow on exposure to any condition. In addition to that, it doesn’t crack or shrink.
It is easy to use and comes with understandable instructions. To clean efficiently, I suggest you do so immediately using a dry piece of cloth. Alternately, you can use isopropyl alcohol to clean.
I don’t recommend this caulk for underwater use, such as in aquariums. Since it is made of 100% silicone, you can use it on doors, window gutters, and other outdoor applications. It will provide the maximum support that you need.
- Silicone makes it tough; it will provide maximum support without cracking or shrinking.
- Easy to use; comes with understandable instructions.
- Easy to clean. However, this needs to be done immediately after application.
- It does not yellow over time. Also, it is mildew and mold resistant.
- Fast-drying in 30 minutes only, and you can expose it to water.
- It is not paintable
- Not applicable in underwater applications.
8. DAP 18128 Acrylic Latex Caulk – best paintable exterior caulk.
Dap 18128 Alex Plus Acrylic Latex Caulk Plus Silicone 5.5-Ounce is an adhesive caulk with multipurpose use. Whether interior or exterior, it will provide maximum support. It comes with a durability guarantee of about 35 years hence saving on the cost of fixing regularly.
This caulk is paintable upon drying hence ideal for fixing surfaces for painting. Also, it cleans well with soap and water. It is easy to use; therefore, you won’t need to pay a technician for an application. This sealant is mildew resistant when cured hence won’t stain.
- Multipurpose; can be used for both exterior and interior applications.
- It’s pintable after drying hence suitable for materials such as automotive.
- Cleans easily with just water and soap.
- Easy to use hence eliminating the cost of hiring a technician.
- This is a highly durable sealant that will last up to 35 years. It is value for money.
- Mildew resistance when cured, reducing the chances of staining.
- Not good for soaking like in water bath, shower, aquarium, and marine engineering.
9. Gorilla 100 Percent Silicone Sealant Caulk – Best Clear Caulking Sealant.
Made of 100% silicone, Gorilla caulk is tough to withstand any pressure. After drying, it will give you a transparent surface that will blend well with the other surfaces. It is ideal for outdoor application as well as indoor. This includes auto, gutters, doors, windows, and many more.
Within 30 minutes, it will be ready for water exposure. This is because it is waterproof, mold, and mildew resistant. After drying, the clear surface will not yellow, crack, or shrink. I recommend this caulk for all outdoor applications.
It is easy to use and clean since it comes with clear instructions and directions of application. Gorilla caulk is a high-quality sealant that is durable and hence value for money. It does not require complex storage conditions. This caulk is ideal for all households.
- Tough since it is made of 100% silicone
- Multipurpose; can be used on a wide range of surfaces.
- Fast-drying; about 30 minutes, and it will be ready for water exposure.
- Mildew and mold resistant. It won’t stain over time.
- When fully cured, it is food safe.
- Won’t yellow on environmental exposure. Also, it doesn’t crack or break.
- Easy to use; just squeezing.
- It cannot be used as an adhesive to hold together parts of different materials.
10. Gorilla Sealant Caulk – best paintable silicone caulk.
This caulk is waterproof, mildew, and mold resistant hence durable. It dries faster where you can paint in about 30 minutes. However, you will need to use less pressure on the brush to avoid displacing the sealant. Within 15 minutes, your sealant will be ready for water exposure. I suggest you paint after 24 hours for excellent results.
Gorilla paintable silicone sealant is waterproof and hence ideal for outdoor application. To ensure a durable seal, this caulk is made to be mold and caulk resistant. Also, it does not crack shrink, making it tough in all conditions.
Also, it is highly flexible hence will withstand any kind of movement. It is easy to use and compatible with a caulking gun. This sealant cleans very well with soap and water.
- Waterproof hence will withstand all weather conditions.
- Fast-drying; it is ready for painting in just 30 minutes and water dry in about 15 minutes.
- Easy to use. Also, it is compatible with a caulking gun.
- Resistant to mold and mildew; it does not crack or shrink.
- Highly flexible hence ideal for outdoor application where there are a lot of movements
- Cleans easily. And it is printable.
- Not suitable for filling gaps and cracks.
Buying Guide: How to Choose the Best Exterior Caulk in 2021
Caulk is broadly categorized into either exterior or interior caulk. So, when choosing exterior caulk, ensure that you check that it is meant for outdoor use. This is because out there, and it will be exposed to various environmental conditions. Extremely high or cold temperatures, wet conditions, UV light, dust, and chemicals are some of the factors that affect exterior caulk.
Making the best choice will save you money and time and offer support to your projects as you require. However, there are internal factors that you need to consider. They include the material of the objects, nature of surfaces, printability, and many others.
When looking at the cost, many people tend to move toward the cheaper end, which is wrong. Remember that cheap is expensive, as the saying goes. Cheap products are sometimes substandard. This means that if you apply cheap caulks and they turn out to be low quality, your project will not last long as intended.
If caulk does not offer maximum support, it may bring additional losses. This will happen where the protected objects either fall off or are exposed to the environment. Always choose a value for money. Quality comes with a cost, and so does durability.
The materials to be bonded affects the choice of caulks significantly. If you are connecting surfaces of materials, the caulk choice will be different from the one used to bond different materials. Even in plastics, some types of caulk will bond one type of plastic better than the other.
Always read the label to know what type of material the caulk can bond. If there was caulk on the surface previously, remove and clean up before applying. Every material has a type of caulk it works best with. Some caulk bond multiple materials so well, and they form better choices.
Some types of caulk are stronger than others. This difference will come out clearly when you use them on projects needed to withstand certain amounts of weight. For industrial setting use, versatile caulk is all you need. It is ideal for movable parts and tasks that need to withstand harsh conditions such as extreme temperatures without compromising supportive features.
Consider the objects bonded with caulk is prone to pressure. If so, more versatile adhesives should be used. Polyurethane caulk and Latex Silicone Caulk are some of the excellently versatile adhesives you can use.
As you purchase caulk, it is good to establish the environment of the application. If you want to seal leaking pipes or leaking gutters, you should consider moisture or water-resistant caulk. Consequently, when dealing with signboards and other outdoor projects, water-resistant should be the main factor.
Exterior projects could send you to the shop regularly when the caulk comes out due to poor choices. There are choices for projects that will stay soaked for a longer time in water and those that will contact water from time to time. If you need to safeguard any object from moisture, select waterproof caulk.
Depending on where you want to apply your caulk, there are factors you should consider. Some caulks are packed in tubes modified to deliver the adhesive right to the sports they are needed. Others come with capabilities for the use of a caulking gun hence suitable for inaccessible joints and corners.
If you want to use your caulk on a surface with gaps and cracks for sealing purposes, you will need to consider if it can fill gaps. Some caulk may fill gaps, while others will not. To seal off movable parts, you will need flexible and versatile caulk. Also, determine whether it is for exterior or interior use.
Have you ever used caulk on a surface, then afterward, when the time for painting comes, you find out that the caulk’s area is not paintable? Well, this may be because the choice of the adhesive was not right.
Many types of caulk will form a perfect painting surface. While Acrylic latex caulks are excellently paintable, Silicone caulk is not paintable at all. Before going to the household stores to purchase caulk, it is ideal for you first to consider where you want to seal and if you need to paint after fixing it. Sometimes we paint to mask off ugly flaws left by sealing, but you will have to like what you chose if your caulk choice is unpainted.
You may choose the right caulk depending on the environment, materials, nature of the project, or even paintability. However, if you don’t consider the application mode, you will miss the whole point. Some projects need precision, particularly where a caulking gun is required, and hence a compatible one will be ideal.
Also, some types of caulk would require certain conditions such as temperatures, cleanliness, and dryness. If you don’t follow this during the application, you may come up with unsustainable bonds. Always pay attention to minor details; they might be carrying more weight than you may think.
Different Types of Exterior Caulk
With so many types of exterior caulk in the market, you may find yourself in a dilemma about which one to choose. Depending on your project details, taking the best caulk will ensure sustainability and maximum support. The type of particular materials involved directs the choice of caulk to use. Different caulks are made of different materials.
Exterior Latex Caulk
Exterior latex caulk is the most common of all. It is the easiest to work with minimal odor and is ideal for both porous and nonporous surfaces. This caulk will fill gaps and easily cleans with water and soap.
Although it weakens under high temperatures and UV light, Latex Caulk is paintable.
Exterior Acrylic Latex Caulk
Also known as painter’s caulk, exterior acrylic latex caulk is a high-quality adhesive that you can use to seal joints on woods. Also, you can use it to fill gaps and cracks on wood.
It dries faster, leaving a well paintable surface. This type of caulk is suitable for a wet environment.
Exterior Silicone Caulk
Exterior Silicone Caulk is the hallmark of waterproof and mildew resistant adhesives. It is useful in fixing water pipes, sinks, and other areas where wet conditions prevail.
Silicone caulk is ideal for application in almost all materials. It is highly adhesive and will provide maximum support. However, it is not paintable at all.
Exterior Polyurethane Caulk
Exterior polyurethane caulk is the ultimate outdoor adhesive. It bonds almost all surfaces, including plastics, concrete, rock, and metals.
This caulk will provide maximum mobility to joints with a stretch of between 300% to 1200%. Also, it will fill gaps on surfaces so well, providing paintable surfaces.
Exterior Butyl Rubber Exterior Caulk
Butyl rubber caulk is ideal for outdoor masonry and metal bonding projects. Though it creates sticky messes, it is strong and versatile where it is applied.
This caulk will fill larger gaps very well, and when applied in movable joints, it will provide greater flexibility. It comes with different formulas, with some being paintable and others are not.
Exterior Modified Silicone Polymers
Modified silicone polymers are sealants with outstanding polyurethane and silicone caulk features, hence providing maximum flexibility. These sealants are resistant to almost all weather conditions and are paintable with latex paints.
Modified silicone adhesives bond a wide range of surfaces, such as aluminum, wood, and cement, among others.
Two Types of Exterior Caulk Container
Exterior Caulk is mostly packed in two types of containers; squeeze tubes that are small in size and cartridges larger in size.
You can differentiate the two types by the level of precision needed, tools of the application, and project size. With a cartridge, a caulking gun must be used.
Squeeze tubes come with a small volume of caulk hence ideal for use in small projects. This is because the little caulk will cover just a small area.
With simple hand squeezes, you can use these tubes to fill in small gaps and cracks on small- scale surfaces.
With large volumes of caulk, cartridges are ideal for large-scale projects. Also, you will need them where you require a high level of precision. However, cartridges have to be used with caulking guns when applying adhesive.
These cartridges are large and cylindrical and could hold caulk enough to seal the bathtub perimeter.
How to Apply Exterior Caulking Properly- YouTube
- Caulking gun
- Razor Scraper
- Soft cloth/linen
- Rubbing alcohol
- Painter’s tape
- Select the right caulk and caulking gun. Either squeeze tube or cartridge, depending on the size of the project. You can use squeeze tubes with the caulking gun, depending on their compatibility.
- Clean and dry the surface thoroughly and remove old caulk if available. You can use a razor to scrape, ensuring not to damage the surface.
- Alternatively, you can use a soft cloth to rub the surface with rubbing alcohol.
- Use the painter’s tape to direct your caulk where to reach. Ensure the tape is straight for uniformity.
Applying the caulk;
- To open the caulk tube, cut the tip of its nozzle at an angle of 45°. For narrow beads, cut it nearer to the tip, while for wide beads, cut it further towards the tube’s body. Puncture the inner seal using a wire by piercing through the nozzle. For a smooth flow, try poking several times.
- However, some caulking guns will come with a seal-breaking puncture pin and a way of cutting the tip.
- Dispense caulk at 45°, ensuring to press hard enough to be forced into joints evenly. Make sure to maintain the same speed for consistency.
- Clean your hands and the spout with a cloth wetted with rubbing alcohol to avoid stick mess. You can use your finger to shape the caulk in cracks and gaps.
- Now remove the tape from the joint and allow the caulk to dry, considering the manufacture’s drying time.
Frequently Asked Questions
Q: What is the best waterproof caulk?
A: Silicone caulk is the best waterproof caulk. It is water and mildew resistant. It is the best choice for plumbing projects such as repairing water pipes, gutters, bathtubs, sinks, showers, and leaking roofs. For all projects that are exposed to rainfall or wet conditions,
Silicone caulk will work well. The seal’s quality is not compromised by wet conditions, even if you soak it for more extended periods. Waterproof caulk is usually flexible and facilitates adhesion on materials of different nature.
However, it may weaken with time depending on how severe the conditions are; either peel off, or you will just find your pipes leaking.
Q: What is the best caulk for exterior wood siding?
A: Exterior Acrylic Latex Caulk is a highly versatile and water-based caulk. Acrylic latex is the best choice for exterior wood siding. It is easy to use with a caulking gun and bonds well with wood. When cleaning, it easily comes out by use of water and soap and well paintable when dry. It patches joints and flames so well. Also, it fills in small cracks and gaps in the woods.
This caulk can withstand high temperatures above 40°C and is durable for up to about 25 years. It comes with different colors that will blend in so well with the color of the wood. For exterior wood siding, I recommend you try Acrylic Latex Caulk.
Q: Can silicone caulk be used outside?
A: Yes. Silicone is explicitly designed to withstand exterior environmental conditions.
Silicone caulk is waterproof and mildew resistant. It can withstand all weather conditions, even to the extremes. Although all types of caulk are prone to yellowing, Silicone caulk will take time before it starts discoloring.
This sealant is strong and versatile, providing maximum support. It forms permanent bonds with almost all materials. However, it is hard to clean. This feature helps it overcome all forces. Even at a low temperature, silicone caulk will still be flexible and won’t be affected by UV light like most conventional caulk. All these factors, plus others, make silicone caulk usable outside.
Q: Can you caulk over old exterior caulk?
A: It is not advisable to caulk over old exterior caulk. This is because of several reasons. First, having two layers of caulk will look ugly as some parts will be uneven. Especially relevant, the old caulk will pull away bit by bit, and the same will happen to the new caulk as it is over it.
To prevent this, always prepare the surfaces very well by first scraping away the old caulk with a razor or special knives designed for removing caulk. Alternatively, you can use a soft cloth soaked in rubbing alcohol to remove it. Take care not to damage surfaces.
Q: How long does exterior caulk last?
A: Taking an example of Silicone gorilla caulk, it can last up to 35 years providing supports to the fixed objects. However, you can always access it to see if you need to redo it. Due to changes in weather conditions, your caulk may start to weaken hence threatening your project. Silicone caulk is resistant to most conditions such as extreme heat, UV light degradation, and extremely wet conditions.
However, if you need to reapply caulk, I suggest you first remove the existing one to ensure a strong bond. If you must apply it over the previous coat due to any reason, consider using a broader bead to cover it entirely.
Q: Is silicone or acrylic caulk better?
A: Silicone caulk is better than acrylic caulk. This is because silicone caulk is long-lasting and will remain flexible throughout without cracking or peeling. With waterproof capabilities, it will keep away moisture better than acrylic caulk. This makes it suitable for use in bathtub repair, showers, toilets, and sinks.
Silicone caulk is the ideal choice for exterior use as it is repellent to moisture hence offering protection from wet weather. However, this feature doesn’t allow the paint to adhere to it.
Acrylic caulk has moisture-resistant abilities too, but over time, it weakens and bursts. This is because acrylic is prone to shrinking with time.
Final Verdict & Recommendations
When looking to buy caulk, you need to consider many things: durability, flexibility, drying time, relation with water, toughness, and of course, cost, among others. You need to buy value for money. Especially relevant, you need to be so keen when choosing the best caulk for exterior application. This is because out there, and it will be exposed to all kinds of weather.
We have researched for you the best exterior application caulk. You can confidently use these and expect excellent results. Most are waterproof and can be used to seal water pipes. Others will help you fill in gaps and cracks as large as 2 inches apart. Also, there are those that you can use for an airproof seal.
I recommend you choose from these best caulks for exterior use as they are easy to use. You will enjoy durability and toughness enough to resist any weather and all kinds of movement.