Best RV Window Caulk Reviews & Buying Guide 2022

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Maintaining the exterior of your RV is mandatory as it helps extend its lifespan by a great deal. The best RV window caulk protects against any damages caused by water because it acts as a sealant. Neither water nor unwanted air will get into your RV once you use this.

The Flex Shot Rubber Adhesive Sealant Caulk is very versatile as it has a wide variety of uses apart from caulking your RV windows and doors. It is also easy to use as you do not need to have a caulking gun for application. Besides, it does not crack nor shrink quickly.

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Top 05 best RV Window Caulk Reviews

01. Flex Shot Rubber Adhesive Sealant Caulk, 8-oz, Clear (2 Pack)

Salient Feature

  • color: white
  • size: 2 pack
  • Batteries included: No
  • manufacturer: Flex shot
  • Dimension: 11.25’x8.05’x4.24’ inches
  • Weight: 6.03 pounds
  • ASIN: B0118DV5W4
  • Wide Applications

Besides using it to seal the windows on your RV, it is also useful in various applications. You can use it in your bathroom to do several repairs on your toilet, sink, bathtub, and shower. If any large or small holes could result in leakages, this caulk will fix that.

  • Ease of Use

Unlike other caulks available in the market, the flex shot caulk does not need a bulky caulking gun to operate efficiently. You can easily use it by pushing the trigger on the nozzle, and you are good to go. This highly improves its efficiency.

  • Versatility

Additionally, it serves three primary purposes. Not only does it caulks the windows on your RV, but it also bonds and seals them to prevent any water from getting inside.

  • Waterproof

To enhance its RV roof sealant role, it does not allow any water to penetrate through it, nor does it get soaked by water. Its waterproof ability ensures it delivers maximum performance. Besides, its almond and white color brands are resistant to mildew.

  • Non-messy

You will not experience any running, dripping, or mess during or after use. This, therefore, gives you an easy time to clean up, thus making it the best RV caulk for vertical surfaces.

  • Durability

It does not crack or shrink quickly, which makes it durable. Hence, your windows will stay protected for a long time.


  • comes in 4 colors
  • no need for a caulking gun
  • not messy
  • formula expands and contracts
  • 100% waterproof
  • versatile
  • caulks, bonds, and seals


  • a little bit pricey.

02. Gorilla White 100 Percent Silicone Sealant Caulk, Waterproof and Mold & Mildew Resistant

Salient Feature

  • color: white
  • size: 6 pack
  • Batteries included: No
  • manufacturer: The Gorilla Glue Company
  • Dimension: 6’x4’x11.5’ inches
  • Weight: 5.04 pounds
  • Usage

It has many uses ranging from sealing RV windows and doors to marine plumbing, caulking kitchen sinks, bathtubs, and gutters. All of these uses make it to become the best RV roof sealant.

  • Mold and Mildew resistant

Do not worry about your RV being infested with mold or mildew, as this sealant is highly resistant to them. This keeps your RV safe, thereby extending its lifespan in the long run.

  • Crack and shrink-proof

This silicone is very clear and will not shrink or crack before or after application. You do not have to worry that it might yellow over time because this is never the case.

  • 30 Minute Rain-ready

Based on a 3/16” bead, you can expose this sealant to water after 30 minutes of application, and it will still work as required. If not, you should wait 24 hours before water exposure.

  • 100% Waterproof

It is worth noting that this caulk does not allow water to penetrate, making it a perfect sealant for your RV windows and doors. Moreover, it dries translucent white and does not leave behind any messes.


  • 100% waterproof
  • mold and mildew resistant
  • does not yellow over time
  • 30-minute rain-ready
  • flexible formula
  • budget-friendly
  • crack and shrink-proof


  • has a powerful odor

03. Red Devil 084620 Window& Door, 10.1oz. Siliconized Acrylic Caulk, Almond

Salient Feature

  • color: white
  • size: 12 pack
  • Batteries included: No
  • manufacturer: Red Devil
  • Dimension: 6’x8’x12’ inches
  • Weight: 14.21 pounds
  • Multi-purpose

The Red Devil 084620 caulk is suitable for use both outside and inside your RV doors and windows to curb against drafts and cold spots and dirt and pests’ entry. Besides this, it is useful in ceiling and wall joints, air conditioners, baseboards, eaves, vents, and crown molding.

  • Adhesion

This simply means it can easily stick on many surfaces soon after application. Some of the surfaces include; painted and unpainted wood, brick, plaster, drywall, aluminum, masonry, cement, metal, and glass, making it the best RV sealant chart.

  • Easy to clean

In case you want to clean it off your RV windows and doors, all you need to do is use water to wash it off. Water makes it come off quickly, and it will not be messy.

  • VOC Compliant

Additionally, it complies with the VOC standards and has been tested severely and thoroughly, making it safe for use.

  • Warranty

It comes with a 35-year warranty. This proves to you that this caulk is very durable and can serve you a long time.

  • Mildew Resistant

Neither mold nor mildew can penetrate or survive on this caulk. This ensures that your RV is not infested with either of those.


  • mildew resistant
  • easy to apply and tool
  • 35 year limited warranty
  • adheres well to various surfaces
  • easily cleans off with water
  • multi-purpose
  • paintable


  • color is light brown, not dark brown as advertised

04. GE GEO12A Silicone 1 All Purpose Sealant Caulk, 10.1oz, Clear- 12 Pack

Salient Feature

  • color: white
  • size: 12 pack
  • Batteries included: No
  • manufacturer: GE Momentive performance
  • Dimension: 11.7’x8.2’x6.2 inches
  • Weight: 9 pounds
  • ASIN: B01DCKTA28
  • 100% Weatherproof

The GEO12A caulk has a 100% silicone formula that efficiently protects your RV’s exterior from any damages by water. It is the best RV metal roof coating used in areas prone to water exposure and winter seasons.

  • Compatibility

It can be used on different surfaces and will adhere without any strain. The surfaces include aluminum, most metals and woods, composites, stone, stucco, bricks, masonry, glass, cement board, drywall, plaster, ceramic and porcelain tile, vinyl siding, PVC, and most importantly, painted surfaces.

  • Mold and Mildew Free

Moreover, it offers your RV 7 years of protection against the growth of mold and mildew. Within 7 years of application, there will be no mildew stains on your RV, thus reliable.

  • Freeze and sun-proof

In areas where the weather is always freezing, this caulk provides a permanent and flexible seal to your RV’s exterior and interior. Besides, it offers protection from harmful UV rays.

  • Rain-ready

You need not worry about the rains destroying this sealant soon after application. This is because it is usually ready for rain exposure as soon as 12 hours after application.

  • Flexible

It is not only a very flexible sealant but also durable and delivers maximum performance to both the interior and exterior of your RV.


  • rain-ready within the same application day
  • compatible with many surfaces
  • lifetime guarantee
  • strong adhesion
  • completely weatherproof
  • all-purpose
  • shrink and crack-proof


  • you need to use a caulk gun for it to be effective

05. Red Devil 0846 Window & Door Siliconized Acrylic Caulk (White), 10.1oz, pack of 1

Salient Feature

  • color: white
  • size: 1 pack
  • Batteries included: No
  • manufacturer: Red Devil
  • Dimension: 11.1’x1.9’x1.9’ inches
  • Weight: 0.726 ounces
  • ASIN: B000BQSV2M
  • Elegant finish

It mainly serves to give your windows, doors, and other surfaces a smooth and elegant finish with no messes after application.

  • Multi-purpose                                             

The Red Devil 0846 caulk works both on the outside and inside of your RV doors and windows. It curbs against drafts and cold spots, thus increasing energy evidence. Similarly, it is useful in ceiling and wall joints, air conditioners, baseboards, eaves, vents, and crown molding.

  • Easy to clean

In case you want to clean it off your RV windows and doors, all you need to do is use water to wash it off. Water makes it come off quickly, and it will not be messy.

  • Advanced Siliconized formula

This RV roof sealant tape improves the 0842620 caulk as it features an advanced Siliconized formula that delivers high-efficiency results. Its cartridge measures 10.1oz, making it suitable for multiple or larger jobs.

  • Adhesion

Do you know that this caulk can easily stick on many surfaces soon after application? Some of the surfaces include; painted and unpainted wood, brick, plaster, drywall, aluminum, masonry, cement, metal, and glass.

  • Warranty

With a 35 year warranty, it can serve you a long time. This also shows how durable and flexible this caulk is.

  • Mildew Resistant

Neither mold nor mildew can get through or survive on this caulk. This prevents your RV from any infestation by the two.


  • mildew resistant
  • perfect for more extensive and multiple jobs
  • reduces drafts and cold spots
  • adheres well to various surfaces
  • advanced Siliconized acrylic formula
  • multi-purpose
  • smooth finishes


  • quite difficult to get it out of the nozzle

Buyers Guide on the Best RV Window Caulk

Finding the appropriate RV window caulk may not be an easy task, especially if you are a newbie. Manufacturers have come up with different brands of caulks, and each of them plays a different role. This part of the article discusses in depth what you need to consider before making a purchase decision.

Waterproof Capability

You should always go for a caulk that is 100% waterproof. This means that it will not let water penetrate through it by any chance. A waterproof caulk protects your RV from any damages caused by water, thus extending its lifespan.

Type of Caulk

There exist different kinds of RV caulks depending on how you plan on using each of them. The acrylic caulk is the most affordable yet common. It helps to seal any cracks present on the windows and doors of your RV. 100% silicone caulk is perfect for use in the bath area of your RV.

There is no significant difference between vinyl and acrylic caulk, apart from the fact that the former lasts longer and is the best fit for RVs. As the name goes, adhesive caulk is usually very sticky, thus adheres quite well on any surface. It sticks together broken pieces.


How much are you willing to spend on an RV caulk? Depending on your needs and how much money you have, you can either get a cheap quality caulk or pricy and good quality. It is essential to get one that is value for the money.

Cheap caulks may easily crack, shrink, or yellow over time. Some may not stick well, and you may eventually regret why you purchased them. Therefore, it is vital to consider quality before purchasing. It is better to spend a lot of money on something worth it.

Sealing Material

What type of material are you using this caulk on? Are they compatible? These are the questions that should come to your mind when buying the sealant. Get a rigid caulk compatible with many surfaces, not only the rubber surface on your RV.

There are caulks appropriate for various surfaces, including; aluminum, metal, fiberglass, PVC, drywall, and ceramic ad cement. Nonetheless, most of this information is mentioned in the product description on the cover of the caulk.

Therefore, you will know if the caulk you are buying fits the surface, you will use it on.

Resistance to UV and Tear

Having a caulk resistant to UV rays makes it convenient in areas where the climate is hot. In case of any exposure to the UV, the caulk will neither crack nor shrink but correctly seal any holes or cracks.

Therefore, a UV resistant caulk is a must-have for any RV owner because of too much sunlight exposure. There is the other factor of tear resistance. This means that the caulk will not tear or rip after application. Even if there is lots of pressure, it shall still be in position.

Easy to use

You do not want to get a caulk that proves hard to use or apply to your RV windows or doors. A good caulk allows you a comfortable time during application without messy and sticky to your hands and the surrounding area.

There are caulks that you can use without the help of a caulk gun. These types just use a trigger and nozzle. They offer less fatigue. Also, cleaning the caulk off is essential. You can either use water or chemical solvents. We recommend you get the ones that need only water to clean them off.

Is there a Difference between Caulk and Sealants?

Many people often interchange these two words. But the question is, are they the same thing? Do they carry out the same functions? They do carry out similar tasks of sealing joints, cracks, or holes. This is their significant similarity.

However, some features differentiate the two. One prominent feature is elasticity. Caulks are defined by their rigidness, which makes them suitable for smaller cracks and holes. Therefore, they are not ideal in areas with extremely hot and cold temperatures. Moreover, they tend to dry out eventually.

On the other hand, sealants are more flexible, their central component being silicone. This makes them more durable and is ideal for areas that change temperatures regularly. They promise to give a tight water seal on your RV, thus protecting it against water damages.

Sealants emit a powerful odor that may not be likable. Also, in case of any spillages, you cannot clean off using water but using chemical solvents.

Additionally, caulks mainly seal cracks that emerge in the house after construction, while sealants stick together surfaces like metal, glass, or plastic. You can easily apply paint over some caulk types, such as acrylic latex, while silicone is not paintable.

Furthermore, caulk is useful on surfaces that experience less movement, whereas the elasticity of silicone enables it to withstand any kind of movement.

Different Types of RV Caulks

Silicone Caulk

They are best for when renovating projects around your house. It features excellent mildew resistant properties that make it ideal for use in the kitchen and bathroom area. Moreover, it withstands harsh weather conditions, including tough UV rays.

This type of caulk is not suitable for use in your RV because it is very hard to get rid of it. You need chemical solvents to make this possible. Therefore, you can hardly re-caulk your RV with it. Besides, it has a strong, pungent smell immediately after application, which disappears later.

Acrylic Caulk

This type of caulk is very common and budget-friendly. Their main advantage is that you can paint over them to avoid the color difference on the caulking surface. They are compatible with surfaces like drywall, mortar, and wood, among others.

Cleaning it off is very easy as you just need water and soap. Their downside is that they are not as elastic and flexible as silicone. They cannot withstand harsh temperatures because they may easily crack or shrink.

Synthetic Rubber Caulk

They adhere very well after application. You can either use them in hot or cold temperatures easily. This is why they are commonly useful, especially on surfaces that experience a lot of movement.

Vinyl Caulk

It is straightforward to use, apply, and clean. You can use it both inside and outside your RV. But for use outside, you need to get one that has a longer lifespan. Also, it is not flexible enough; therefore, using it in areas where temperatures keep changing is not recommended.

Fireproof Caulk

This type of caulk is not very common, but it will play a massive role in fires. It will prevent the flames from penetrating through the cracks that have a sealant.

Adhesive Caul

Just as the name goes, this caulk is usually sticky by nature, so it will easily stick on any surface. They are best for sticking together pieces that broke and resulted in a crack. They will not only seal the crack but also piece together the broken pieces.

Benefits of an RV Caulk

Extends RV’s lifespan

Using the best RV window caulk not only extends the lifespan of your RV but also improves its general look. It is among the best maintenance practices carried out on your RV. If you feel the need to resell it, the caulk will give it an attractive appearance that will excite a buyer.

Curbs against dirt and Insects

Sealing any holes or cracks on your RV prevents entry of dirt or any other insects into your RV. This will ensure your RV stays clean throughout your stay on the road. No insects will infest your food nor disturb your comfort. It is essential to check that all entry points are sealed for high-performance results.

No Growth of Mold and Mildew

Naturally, mold and mildew grow in areas where there is a lot of moisture. Most of the caulks have mildew or mold-resistant feature that ensures there is no such growth. Watertight seals prevent water from penetrating your RV, and by this, no mold or mildew survives in a dry environment.

Prevents against Leakages

In case of any leakages, the caulks will fix this. Once you fix all the unnecessary openings on your RV windows and doors, there will be no room for water to go through and cause leakages. This greatly prevents water damages on your RV’s roof, floors, and walls.

No Energy Loss

When you apply caulk on holes and cracks, it will control the amount of cold and hot air getting into your RV. If the spaces are left open, hot and cold air is likely to escape, which increases the consumption of your RV’s air conditioner.

How to re-caulk RV Windows

Step 1: Prepare the materials

The first thing to do is to identify any holes, cracks, or leaks available on your RV. After finding it, get rid of the old caulking to make room for the new one. You may use water and soap to wash it off or a razor blade to scrap it off.

You need to have an RV caulk, caulking gun, masking tape, ladder, sponges, petroleum jelly, and a razor blade.

Step 2: Clean up the Window

The next step is to clean up the window using a sponge after getting rid of the old caulk. Make sure it is very clean so that it will allow you an easy time to re-caulk. To reach the hard to reach areas of your window, you may use a ladder.

If you need to prevent the caulking from leaking to other areas of your window, you can cover the rooms with masking tape.

Step 3: Apply Caulk

Get your caulk ready for application. If it has a nozzle and trigger, you will not need to use a caulking gun for application, which you find convenient. You can then begin the application process.

Begin by putting a whole chunk of caulk around the entire edge of your window. After this, you can now sign on the part that is leaking and carefully spread the caulk. In case you are using a caulking gun, ensure you release the gun’s lever to avoid any kind of a mess.

After that, you can use some petroleum jelly or any other tool to level the caulk on the window. The petroleum jelly prevents the caulking from sticking on your hands.

Finally, after getting done with the application, you can dry at least 24 hours-48 hours. This provides the surface with an excellent and smooth finish after that. You can then remove the tapes you had earlier placed on the window area.


Having gone through these reviews keenly, you can agree that finding the best product that satisfies your needs is very simple. You need to use the information learned from above when searching for your best product. Therefore, ensure that the brand you pick fits your budget as well as your needs.

However, if you have any problem selecting the best RV window caulk, never hesitate to visit our website. On our site, we provide all the necessary information that will enable you to make the right decision on which product to pick from the list.

Recent Posts:


  • What is the best caulk to use around windows?

You can either use a 100% silicone or long-lasting polyurethane caulk, shrink-proof and waterproof for best results.

  • Where should you not caulk around windows?

You should not caulk the weep hole of your RV window. The purpose of this hole found at the bottom of the outer frame of windows is to allow moisture behind the window to escape through the structure.

  • Should I use caulk or silicone around windows?

This depends on some factors. You can use both of them. Caulk will dry much quicker than silicone and is more resistant to weather.

However, it is not suitable for areas that experience frequent movements. It may be rigid after drying up. If you need long-lasting protection for your windows, use a caulk made from 100% silicone or polyurethane.

  • Do I have to remove the old caulk before caulking?

It is not a must to get rid of the old caulking before applying a new layer. You can use a wider bead of new caulk over the old layer of caulk, which sticks on both sides of the surfaces, not caulked.

  • Why does caulk crack around windows?

It might be due to low-quality paint, usually chalky or sheetrock dust, not cleaned off the surface.

  • How long does RV caulk last?

Most caulks are long-lasting, some even having a warranty period of up to 35 years. They usually stick very well on the surfaces applied on. So, the answer is that RV caulks last several years depending on the quality and how frequently you use your RV.

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