Reviews

Best RV Caulk: Prevent Your Roof From Leaking

Stay dry in your RV with these high-quality caulking products.

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BY Noelle Talmon / LAST UPDATED ON October 20, 2021

It's critical to maintain the roof and other areas on your RV, as leaks can cause major, and potentially expensive, problems. That's where a good-quality RV caulk comes in, working to prevent leaks by patching seams, holes, and problem areas where moisture, rain, and debris can enter your RV’s confines. It also keeps mold and mildew from forming, which is not only unsightly but also unhealthy. The right caulk forms a solid and watertight seal to keep all moisture out. Our buying guide below features some of the best RV caulks available as well as some features to look for in order to find the best product for your needs.

Best Overall
Ziollo RV Flex Repair Caulking Lap Sealant
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Summary
Summary

This white RV caulk is non-toxic and meets both indoor and outdoor needs. It's compatible with a variety of surfaces and is waterproof, breathable, and flexible.

Pros
Pros
  • Wet or dry application
  • Blocks dirt, dust, and moisture
  • Easy to use
  • Lifetime warranty
Cons
Cons
  • A little pricey
  • May not self-level well in cool temps
  • May be runny
Best Overall
Ziollo RV Flex Repair Caulking Lap Sealant
Best Value
Gorilla 100 Percent Silicone Sealant Caulk
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Summary
Summary

Gorilla's caulk can be used for a variety of applications on RVs, at home, for marine use, and more. It is a silicone caulk that dries translucent.

Pros
Pros
  • Waterproof
  • Mold- and mildew-resistant
  • Cures quickly
  • Easy to apply
Cons
Cons
  • Emits a chemical odor
  • Resembles a thick glue when dry
Best Value
Gorilla 100 Percent Silicone Sealant Caulk
Honorable Mention
Dicor RV Rubber Roof Sealant Self Leveling Caulk
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Summary
Summary

This white caulk from Dicor is one piece of a three-part roofing system. It can be used on a variety of surfaces, including EPDM and TPO sheeting.

Pros
Pros
  • Cures quickly
  • Waterproof
  • Long shelf life
Cons
Cons
  • Can take a while to self-level in hot temps
  • May be difficult to use for those new to caulking
Honorable Mention
Dicor RV Rubber Roof Sealant Self Leveling Caulk
Using RV caulk on plastic surface
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Best RV Caulk Reviews & Recommendations

Best Overall
Ziollo RV Flex Repair Caulking Lap Sealant

Specs:

  • One 10-ounce tube of white RV caulk
  • Designed for roof maintenance
  • Non-toxic and eco-friendly

Why We Picked It:

Our top pick is Ziollo's RV caulk, which is non-toxic, non-hazardous, and safe to use both indoors and outdoors. It's designed to replace caulk that is splitting and peeling and can be used on a variety of surfaces, including EPDM, metal, aluminum, PVC, Kynar, wood, concrete, and fiberglass. The caulk is waterproof, prevents leaks, and has a flexible and breathable seal that won't shrink. It blocks dirt, dust, and moisture, and works with Ziollo's RV Flex Repair Roof Seam Tape and RV Flex Repair 100% Silicone Roof Coating for added protection.


You can apply this caulk in wet or dry conditions and paint over it within 24 hours. Simply clean the surface area, cut the tip, puncture the internal seal in the tube, and apply the product to the desired area. The company also provides a lifetime warranty should you experience any issues. Overall, it adheres well to different surfaces — even vertical ones — flows nicely, and levels out smoothly. One downside is that it may not apply as efficiently in colder temperatures. It may also be slightly runnier than some rival brands, but this can be prevented if you shake the tube well before application.

Pros:

  • Easy to use
  • Flexible and will not shrink
  • Levels out smoothly

Cons:

  • May not self-level as well in cooler temps
  • May be slightly runnier compared to other brands
Best Value
Gorilla 100 Percent Silicone Sealant Caulk

Specs:

  • Silicone caulk that dries translucent
  • Several sizes available
  • Various applications

Why We Picked It:

The Gorilla Silicone Sealant Caulk is available as a single canister, six-pack, or eight-pack, so you can get as little or as much as you need to repair your RV. While it's not designed specifically for RV repairs, it can certainly be used for sealing gaps or cracks on a variety of areas on your RV, including skylights, windows, doors, showers, etc. It's mold- and mildew-resistant and is designed not to turn yellow, shrink, or crack.


This product dries translucent clear and is 100 percent silicone, 100 percent waterproof, and can be exposed to moisture just 30 minutes after application. It dries quickly, won't peel off, is easy to use and clean up, and is durable and affordable. One downside is that it emits a chemical odor. Also, it's thick, and it looks like a thick glue when it dries, which may be unappealing to some. There's no cap to seal the tube, so it will dry out if you try to save the remaining caulk for future projects.

Pros:

  • Mold- and mildew-resistant
  • 100 percent waterproof
  • Dries quickly
  • Easy to use

Cons:

  • Emits a chemical odor
  • Looks like thick glue when it dries
  • No cap to seal unused caulk for later use
Best Roof Protection
Dicor RV Rubber Roof Sealant Self Leveling Caulk
Specs:
  • Four pack of white, self-leveling caulk
  • Compatible with EPDM and TPO sheeting
  • Works on a variety of surfaces

Why We Picked It:

Dicor's RV rubber roof sealant and self-leveling caulk is one part of the company's three-part roofing system and is designed to seal cracks and leaks along an RV roof's edges, vents, pipes, and screw heads. You can use this product on aluminum, mortar, wood, vinyl, galvanized metal, fiberglass, and concrete. It's also compatible with EPDM and TPO sheeting. 


Before using this caulk, clean the surface area and let it dry, then apply the product using standard caulking tools. In temperatures between 50 and 70 degrees Fahrenheit, it takes just a few minutes to cure. It's waterproof within 48 hours. If you store it in a dry location in temperatures between 55 and 85 degrees Fahrenheit, the product will last "indefinitely" according to the manufacturer. However, if you apply it in hot temperatures, it takes a while to level out. It can also be a little difficult to smooth out if you're not experienced with using caulk. 

Pros:

  • Effectively seals cracks and leaks
  • Easy to apply
  • Waterproof
  • Stored properly, the product has long shelf life

Cons:

  • Part of a three-part system, so more products need to be purchased
  • Doesn’t level out well when applied in hot conditions
  • Can be difficult to smooth out
Easiest To Use
Flex Shot Rubber Adhesive Sealant Caulk
Specs:
  • Two 8-ounce tubes of white caulk
  • Cures in 24 hours
  • No caulking gun required

Why We Picked It:

Flex Shot's caulk is designed to bond with just about every surface, including those in kitchens, bathrooms, roofs, cement, brick, and RVs and campers. This thick, rubberized caulk creates a strong yet flexible bond and is resistant to temperatures up to 350 degrees Fahrenheit. The product is mildew-resistant and cures completely in just 24 hours. 


No caulking gun is required — just make sure the surface area is dry, and clean it to remove all dirt and debris. The extension tube makes the application, even in hard-to-reach spots, quite simple and is designed not to run or drip, and it expands and contracts to fill cracks and holes. The bottle is also designed so you can use it over and over again. Overall, it's durable, long-lasting, and easy to use. One downside is that it emits a strong smell. It's also a little on the pricey side, and it can be tough to apply in a straight line if you're not used to using caulk. 

Pros:

  • Creates a strong yet flexible bond
  • Easy to use
  • Durable and long-lasting

Cons:

  • Emits a strong odor
  • Pricey
  • Straight lines are hard to produce if you’re new to caulking
Best for RV Vents
Durevole RV Camper Travel Trailer Roof Self-Leveling Caulk
Specs:
  • Four pack of white caulk
  • Designed specifically to seal RV vents
  • Compatible with many types of materials

Why We Picked It:

Durevole's self-leveling white caulk is designed specifically to seal RV roof vents, vent pipes, roof edges, and screw heads. It's compatible with a variety of materials, including aluminum, brass, steel, glass, mortar, wood, PVC, EPDM, TPO, and TPV, this weather-resistant caulk forms a waterproof and breathable seal. It does not require any primer and can be painted over. It also stays flexible for many years and will not shrink.  


We like this option because it doesn't require any mixing. It's also designed to work in extreme temperatures from negative 40 degrees to 200 degrees Fahrenheit. However, it may not self-level as well as some competing brands and as a result, you may need to use a spackle knife or other tool to smooth it out. It can also be difficult to squeeze out of the tube, and since it's designed for RV roof vents, it may not work well on other areas of your RV.

Pros:

  • Waterproof
  • Works in extreme temperatures
  • Stays flexible over time

Cons:

  • Doesn’t self-level as well as other brands
  • Can be difficult to squeeze out of the tube

How We Selected the Best RV Caulk

We took many factors into consideration when choosing the best RV caulks and after examining numerous products, we made sure to choose only those that are made from well-known manufacturers within the industry. Most of the caulks on our list are designed specifically for RV use, while a couple are good enough that you can use them in a variety of different applications including RV roofs, making them versatile options. We also looked at the curing time, weather resistance, and other features to ensure that these caulks meet the needs of most RVers. We also made sure to choose products that fit most budgets. 

Our product selections, rankings, and awards for this story are based on research. While we haven’t conducted real-world testing on all of these products yet, we’ve looked at consumer testimonials and data, tutorials, and general discussions on social media and in forums. We also consider price and specification in the context of the segment. And, of course, we rely on our institutional knowledge of the automotive landscape to weed out weak products.

Buying Guide/What to Look For 

There are several things to take into consideration when choosing the best caulk for your RV, motorhome, or camper. First, there are several types available, so you need one that fits your particular needs. You also need to make sure the product adheres to the surface material that you are repairing and is waterproof if it's exposed to moisture. Check out some other important criteria below.

What to Consider When Buying RV Caulk

Key Features

Purpose

RV caulks are not a one-size-fits-all solution. First, determine what you need to repair. For example, do you need to fix the shower, a hole on the roof, or a seam near the vent? Smaller jobs will require simple caulks, while bigger jobs (and large holes and cracks) will need an option that's more heavy-duty.

Material

Different types of caulks work with different types of materials. Some work well on rubber roofs, while others are compatible with fiberglass surfaces. Check the product's specs to determine if it will work with the material you plan on repairing. The wrong caulk can peel off, and the leak will not be corrected. 

Waterproof and Temperature-Resistant

Any area on your RV that is exposed to water and moisture, such as the roof or windows, will require a waterproof caulk. Some brands can be used when surface areas are wet, making application a lot easier. There are also caulks that are designed to withstand wilder temperature fluctuations, including super high highs and low lows, which is helpful if you spend a lot of time camping throughout the summer and winter.

Types 

Silicone

If you plan on sealing the shower or your roof in your RV, silicone is the best option. It is durable, mold- and mildew-resistant, and good for non-porous surfaces. You can use it around vents, windows, and other areas on your RV. It also has a long lifespan and is strong and flexible. 

Acrylic Latex

Acrylic latex caulk is affordable and widely available, making it a popular option. It's also known as painter's caulk because painters use it on small cracks and holes before applying a layer of paint on top of it. Acrylic latex does a good job of sticking to a variety of materials, and it takes just 60 minutes to dry, so you can apply a layer of paint on top fairly quickly. To clean an area treated with a painter's caulk, simply use soap and water.

Vinyl Latex

We like vinyl latex as it's easy to apply and clean, and you can use it indoors and outdoors. Just make sure you choose a brand that is durable if you plan on using it on an RV roof. One downside with this type of caulk is that it's not as long-lasting as acrylic latex. Also, it's not particularly flexible, so it's not a good option for areas that are known for contracting and expanding.

Tips and Tricks

As with something you do for decades upon decades, you pick up a few tips and tricks along the way in terms of selecting the right product, and/or using it. That’s the case with us and RV caulks. To help you bridge the information gap, here’s a selection of what we’ve learned along the way.

  • Look for products that are easy to use. They should not be difficult to clean up if you make a mistake, for example. You should also be able to rinse it off with soap and water. 
  • Some caulk brands dry quickly, which is convenient. However, they may not last as long as options that take a couple of hours to cure. 
  • Look for a self-leveling caulk. It should adhere firmly to the surface and shouldn't require a putty knife to smooth itself out. 

FAQs

Q: How do you repair cracked RV caulking?

Once the caulk cracks, it's too old to repair. Instead, you should scrape it off and replace it with a new layer of caulk.

Q: How do you seal seams on an RV?

First, make sure the caulk is compatible with the RV's material. Scrape off the old caulk, and clean the surface area. Then apply the new caulk and let it dry as recommended by the manufacturer.

Q: How often do I need to caulk my RV roof? 

It's a good idea to inspect the roof several times a year. Then repair any cracks, holes, or tears in the roof membrane. Preventative maintenance can save you money and headaches.

Final Thoughts

Our pick for the best RV caulk is the Ziollo RV Flex Repair Caulking Lap Sealant. This non-toxic caulk is compatible with a variety of different surfaces. It's waterproof, flexible, and breathable. It can also be painted over within 24 hours and is easy to apply, making it a great choice overall.