Gearhead News

April 13, 2021
Best RV Roof Sealants and Coatings: Top Picks for Cracked Roofs

Heng’s Rubber Roof Coating
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Coming in a 1-gallon container, this is a non-toxic roof coating that effectively seals tears in rubber roofs, air conditioners, vents, and more.

  • Thin formula that’s easy to spread and clean up 
  • Resists cracking by expanding and contracting with the roof
  • Dries into a UV-resistant coating 
  • Doesn’t cause pollution nor emit strong fumes
  • Needs to be re-coated more frequently than silicone coatings
  • Finished coat may be slightly grayish

Dicor EPDM Self-Leveling Sealant
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Available in a 10-ounce tube, this sealant is designed to adhere firmly to fiberglass, wood, aluminum, mortar, vinyl, and concrete.

  • UV-stabilized formula that resists discoloration or deterioration
  • Doesn’t stain or discolor the material
  • Remains flexible even after its fully cured
  • Reduces roof vibrations
  • You may need several tubes to seal up the entire RV
  • Emits strong fumes

KST Coating Elastomeric Finish Coat
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Available in a 4.75-gallon container, this is a white elastomeric roof coating that forms a rubber-like seal to help prolong the life of the roof.

  • Maintains a durable coating on the roof despite moisture and UV rays
  • Resists mildew and algae buildup 
  • Remains flexible at temperatures ranging from -10 to 160 degrees Fahrenheit
  • Dries into a thin coat that tends to flake after some time
  • Not as durable as most elastomeric coatings

Why Trust Us


All of our reviews are based on market research, expert input, and practical experience with each product we include. This way, we offer genuine, accurate guides to help you find the best picks.

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Benefits of RV Roof Sealant & Coating

  • Structural protection. First and foremost, sealing up any cracks that have already occurred and preventing new ones with roof sealant is an investment in the structure and longevity of your RV. A layer of rubber roof sealant will also help prevent any warping from the heat and will save you money in the long run by helping to prevent costly RV roof repairs.
  • Temperature regulation. A roof coating forms a protective barrier that helps to regulate the temperature inside your RV, which will keep things cooler in the summer and warmer in the winter. As an added perk, you’ll likely end up using less power, since you won’t have to crank up the air conditioning or heating.
  • Reduced wear and tear. The roof surface of your RV takes a real beating over time. With repeated exposure to the elements, your RV’s roof can start to show signs of wear and tear. Having rubber roofing atop it helps keep that wear and tear to a minimum.
  • Energy use reduction. RVs use a lot of energy when in use, even on short trips. An RV roof coating can help reduce these costs due to the added insulation it provides to your vehicle. Less power used, more money saved.
  • Reduced costs. In the same vein, keeping your RV in tip-top shape by protecting the roof from damage and the structure from warping, you’re saving a lot on roof maintenance down the line. That’ll help keep more cash in your wallet.

Types of RV Roof Sealant & Coating

Liquid Sealants/Coatings 

Just like paints, liquid sealants or coatings require a bit of surface preparation before you apply the sealant. You need to clean and prime the surface before applying the product, and due to their low viscosity, they may take a while to fully cure. It may take a few weeks before you can repaint the roof. You can either find silicone, acrylic, or urethane-based liquid sealants, with silicone being the most expensive but durable option.  

Sealing Tape 

Instead of worrying yourself with a lengthy surface preparation and coating process, you can opt to simply seal the leak with a tape that’s treated with an adhesive sealant. The sealant forms an airtight bond with the roof to block out moisture and consequently stop the leak. Most can expand and contract with the roof depending on the weather conditions, and can last for several years.

Top Brands

Rust-Oleum 

Founded by Robert Fergusson in 1921, Rust-Oleum is an Illinois-based manufacturer of protective paints for home, automotive, and industrial use. Its products help to prevent rust and corrosion, and they include brush-on or spray-on products that can be used on almost any surface. The Rust-Oleum LeakStop Rubber Coating is one of its best-rated products.

Dicor Products

A leader in the RV industry, Dicor Products makes everything you need to keep your RV in great shape. Based in Elkhart, Ind., Dicor has been in business for almost 40 years, and have continually worked on improving their products. Some of their top sellers are the EPDM Self-Leveling Lap Sealant and the Rubber Roof Acrylic Coating.

Liquid Rubber

Based in Ontario, Canada, Liquid Rubber makes a number of different RV sealant and coating options, including the popular liquid roof coating formulation. All their products are manufactured to high standards, so you know what you’re getting. Bestsellers include the Brilliant White RV Roof Coating and Sealant.

RV Roof Sealant & Coating Pricing

  • Under $15: You’ll find mainly roof sealant products at this price point. The quality of the formulations varies quite a bit, but it’s possible to find good quality at a great price. Packages will also be smaller than at other price points.
  • $15 to $40: The mid-range is home to a wide variety of products, from sealants to coatings, in a number of different formulations. The quality is usually good to very good, but still, keep an eye out for the brand you’re buying from.
  • $40 and up: Complete roof coating kits come at this price point, as well as a couple of pricier formulation-only options. Top quality comes at a bit of a higher price, but you’ll get what you paid for. Durable silicones tend to be in this price range.

Key Features

Type

It’s important to remember that sealant and coating are two similar products that serve different purposes. If you’re looking for a product that insulates your RV, protects from weather damage in a number of different weather conditions, and adds structural integrity, you’ll want an RV coating product. If, on the other hand, you want to fix cracks or leaks in the roof, or another patchwork that involves small areas, a sealant is a better choice for the job.

Formulation

We’ve touched on this before, but we’ll say it again. The material your coating or sealant is made of makes a big difference in terms of how it performs. When it comes to pasting sealant and tape sealant, the formulation itself matters less than the overall quality of the product, but RV roof coatings are made from vastly different materials. The best, in terms of weather resistance, is silicone, but acrylic and urethane also serve their purposes.

Ease of Application

Formulations differ quite a bit in how they’re applied, how long they take to dry, and how many coats they need to work most effectively. Silicone is one of the easiest products to work with. It dries quickly, needs only one coat, and is easy to apply. Acrylic and urethane products vary, but many require at least a primer coat and multiple coats of the product to reach full capacity.

Other Considerations

  • Type of Roof Material. Rubber roofs (EPDM or TPO roofing) are the most common type of RV roofs so select a formulation that can adhere to rubber and is non-corrosive to the material. Any other material (fiberglass or metal) is typically compatible with an all-purpose sealant or coating, but always consult the product’s manual for the types of material it’s tailored for. 
  • Elasticity. To withstand temperature changes, you will need an elastic or flexible sealant or coating that can elongate or contract with the applied surface. Simply put, ensure that it has enough tensile strength to withstand being exposed to different temperature conditions.
  • Packaging Size. Keep in mind how much of your roof needs to be repaired or how much you want to coat. That’ll help you decide if you want to invest in a big bucket of a coating or if a roll of sealant tape will do the job.
  • Color. Sealant and coating products come in a couple of different colors, including clear and white. Choose whichever matches your needs best, and keep in mind that bright colors reflect more sunlight.

Best RV Roof Sealant & Coating Reviews & Recommendations 2021

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Best Overall
Heng’s Rubber Roof Coating
Durable, Flexible, and Non-Toxic Coating

A favorite among mobile home and RV owners alike, this Heng’s roof coating is one of the best out there. Designed for use over RV rubber roofs, it’s ideal for sealing up and tears and cracks, and for waterproofing air conditioners and vents. The UV resistant formulation makes it stand up to the summer heat. Once applied, the coating will expand and contract with your RV’s roof to resist cracking and degradation. It’s also non-polluting and non-toxic, so you’re protecting your health and the environment while using the product. The bright white colors make this a great pick for replacing Motor Coach rubber roofs. Overall, the product is really easy to work with, requiring fewer coats than the competition. The formulation is also safe to use in sunlight and won’t bubble or crack even when freshly applied. A primer will help the formula go on even more smoothly, but it’s not required, saving you money in the re-coating process.

What we weren’t completely sold on was the fact that it’s an acrylic formulation, which means that it’s not going to be as long lasting as a silicone one. It’s still a great product that does the job extremely well, but keep in mind that a couple of years down the line, you’ll have to re-coat your RV’s roof again.

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Best Value
Dicor EPDM Self-Leveling Sealant
Quick Fix To Small Leaks

This Dicor sealant works extremely well for creating a secure, secondary seal along your RV roof’s edges, vents, and screw heads. Made to adhere to a number of different surfaces, including wood, vinyl, aluminum, galvanized metal, fiberglass, and more, it’s a great fit for a wide range of different RVs. It’s also compatible with EPDM and TPO sheeting, and the sealant’s white color makes it blend well with most RV roofs. As a self-leveling sealant, it’s best for use on horizontal surfaces, as the formulation is too runny to be used vertically. When using this product, remember to use a larger amount to cover screw heads, so that the product can spread out and level. If you’ve got a leak or are hoping to prevent them by sealing up all possible nooks and crannies, this is the product for you.

One major downside is the size of the tube it comes in. If you’ve got a large RV and want to seal the whole roof, it could take up to 5 or more tubes to finish the job. But, on the other hand, water damage will be more expensive to fix than sealing everything up properly. It’s also worth mentioning that the formulation has a learning curve before you’ll be a pro at applying it.

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Most Versatile
KST Coating Elastomeric Finish Coat
Offers All-Rounded Protection

KST Coating offers a white, elastomeric, resin coating that cures into a rubber-like coat to help seal leaks on roofs. Some of the benefits it offers include protection against moisture, mildew, algae, and soap. Therefore, it’s the best coat for RVs that are frequently used in humid conditions. Also, it resists up to 90 percent of harmful UV rays and retains its adhesive even in the harshest weather conditions. The coating will retain its flexibility at a temperature range of -10 to 160 degrees and will expand and contract with the substrate. What’s more, the manufacturer backs this product with a seven-year warranty.

 

However, it dries into a thinner coat than most elastomeric coats, meaning that it may not be as durable if you don’t do at least two coats. It might also start to flake with time.

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Best Clear Coat
Rust-Oleum LeakStop Rubber Coating
Clear Finish for Painted RV Roofs

Boasting a crystal clear color that’s ideal for any roof color, the Rust-Oleum Leakstop Rubber Coating is an oil-based formula that’s a great choice for interior or exterior use. The formulation comes in a 30-ounce container, which is enough to cover 40 square feet. It’s easy to brush on and penetrates tight, hard-to-reach spaces so it can fill up tears and cracks on your roofing. The applied coating dries within an hour forming a flat finish that can be painted over. When fully cured, it provides a waterproof coating that resists damage from normal rainwater pressure and also resists rust and corrosion. Also, it’s designed for cold and hot weather alike since it can withstand temperatures ranging from -80 to 350 degrees Fahrenheit. Besides RV roofs, it can also be used on concrete, gutters, PVC, ductwork, and more. 

However, you should know beforehand that it emits strong fumes so you may want to use a gas mask when applying it and consider ventilating your RV for a few hours and until the fumes die down.

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Easiest to Apply
Ziollo RV Flex Repair Tape
No-Brainer Application

For a quick and mess-free solution to leaking RV roofs comes the Ziollo RV Flex Repair Tape. It’s a white tape that’s 50 feet long and designed with an adhesive butyl sealant, which forms an airtight seal with EPDM rubber roofing, plastic, metal, fiberglass, and almost all surfaces except silicone. The tape works best when applied on a clean surface, and to effectively seal large cracks, you can overlap the tape on itself. You also get a seam roller with the package to help activate the sealant on the surface. Once it has fully adhered to the surface it creates a waterproof layer that remains flexible even as the temperature changes. It also resists UV ray damage. 

You should be warned that the tape is quite sticky so you risk wasting a lot of it if you pull out too much. It may stick to your hands or surrounding surfaces that you don’t intend to seal. Work with small strips at a time.

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Honorable Mention
Liquid Rubber RV Roof Coating
Highly Flexible for a Durable Bond

An important feature in an RV roof coating is flexibility and that’s what you get with the Liquid Rubber RV Roof Coating. Coming ready-to-use straight out of the container, this coating is designed to adjust to even the mildest temperature changes by expanding and contracting with the applied surface to maintain a durable seal. It also reflects sunlight thereby helping to keep your RV cooler in the summer. One gallon is enough to cover a 50 square foot area, and it can be applied with either a brush, roller, or you can load it into a paint gun. Also, you don’t have to worry about wearing a gas mask as it’s an eco-friendly formula that doesn’t emit harmful odors. Plus, it’s not sticky, so the application won’t be messy. 

You need to apply about two to three coats to achieve a heavy-duty membrane that effectively keeps out water. This means that you may have to buy more than a gallon if you have a large motorhome and would like to seal all the edges.

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Honorable Mention
Flex Seal Liquid Rubber in a Can
Effectively Seals Out Moisture

Flex Seal’s Liquid Rubber is definitely a workhorse. Not only can it be used to coat your RV roof, but it’s also suitable for any other use case where you want to lay down a watertight and flexible rubberized coating. The formulation is designed to go on extra smooth. It can be rolled, poured, or brushed on, and levels out quickly. It seals out water and moisture and is mildew resistant. Another great feature is that the formulation is UV-resistant and non-flammable, plus it’s non-toxic and safe for use around plants and animals. It also prevents rust and corrosion and stands up to chemicals. If you need something that can really take a beating, this might just be the pick for you. 

Keep in mind that you’ll need about three coats to properly recoat your RV’s roof. That’s not the best news when you consider that the product is also on the pricier side. However, you’ll end up with a durable rubberized roof, so the investment should pay off in the end.

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Honorable Mention
Rubberseal Liquid Rubber Protective Coating
Universal Application on All Roofing Systems

This is a multi-purpose roof sealant that can be used on all roofs, including RV roofs. It’s a liquid rubber sealant that cures into an expandable acrylic coating, which doesn’t crack easily. It’s also a water-based formula that’s rated low in volatile compounds. Therefore, the sealant won’t cause premature degradation of the applied surface. It’s a roll-on sealant that spreads at the rate of 60 square feet per gallon at 20 imperial mils, which provides the best bang for your buck. Also, it retains its elasticity for a relatively long time and will continue to expand and contract alongside the roof. It forms a reflective coating that protects your roof from further degradation caused by UV rays, snow, rain, and even extreme weather conditions. It also resists moisture and can help reduce the ambient temperature in your RV. 

While the product goes on easily, it also takes on dirt just as easily. You may be forced to peel it when it gets too discolored. Also, you need fairly good weather for the product to cure evenly. Otherwise, it will be porous and may leak when it rains.

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Honorable Mention
Premier Pro Products RV Roof Sealant
Self-Leveling Roof Sealant

Premier Products pro offers a universal roof sealant that can be used on almost all roofing systems, including RV roofs. The sealant is compatible with rubber, wooden, asphalt, and metal roofs. It’s available in a 25.3-ounce pouch, which is enough to cover 130 linear feet. The benefit of having the product in the pouch is that the pouch is resealable and allows for easier and mess-free application. Also, you don’t need to use a caulk gun to apply it, and since it’s self-leveling, you get a smooth finish for little effort on your part. What’s more, this roof sealant has tough physical properties — it resists blistering in heat and has great elongation so it can expand and contract with the roof.  

Unfortunately, this product is not designed for cold temperature conditions. It works best within a temperature range of 42 to 120 degrees Fahrenheit. It may freeze and crack when temperatures drop below 40 degrees Fahrenheit.

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Honorable Mention
ToughGrade Self-Leveling RV Lap Sealant
Dries Quickly Into a Smooth Finish

Designed for rubber roofs, the Tough-Grade Self-Leveling Sealant is a UV-stabilized formula that prevents leaks while resisting further sun damage and discoloration. It’s designed for horizontal surfaces, which is how it works to self-level itself, and effectively seals up cracked surfaces to prevent leaks. It can withstand extreme temperatures and harsh weather without peeling. Also, it doesn’t freeze when exposed to snow. Any DIY warrior will find it easy to apply once you have prepared the surface. It can also be used to seal air vents, vent pipes, and other forms of material, including wood, concrete, aluminum, vinyl, and galvanized metal. It dries fairly quickly, and you can paint over it. 

While it doesn’t discolor the applied surface, it does have an off-white color that may not look appealing on a white roof. Another downside is that it may not self-level as evenly as you would expect. 

Tips

  • It’s a good idea to apply thin coats of acrylic or urethane RV roof coating instead of one thick one. This will help the product work more effectively.
  • Use a caulking gun to apply a sealant for easy coat application. Some sealant products already come in similar packaging just for that very reason. If yours doesn’t, fill it over into a caulking gun and make the task of fixing your RV roof an easy one.
  • Make sure to thoroughly wash your RV before applying any sealant or coating products. You want to make sure that everything, especially the roof, is clean and dry, and follow any additional prepping steps accompanying your product’s instructions.
  • It’s a good idea to work in a shaded and well-ventilated area to allow the product to set properly. Too much heat and sunlight can warp the roof a bit, making the coating uneven.
  • The easiest way to repair roof leaks is with sealant tape. It’s quick, easy to use, and, most importantly, incredibly effective at getting the job done.

FAQs

Q: What’s the best way to apply RV roof coating?

It’s a fairly simple process that’s definitely suited to DIY. You’ll want to start by making sure your RV is clean and take any other prepping steps mentioned in the product you purchased to coat your roof. It’s also helpful to wipe down the whole roof with denatured alcohol after removing any old sealant to ensure a clean surface on which to adhere to the new coating. Then, just follow the instructions included with your coating.

Q: What formulations should I look for?

You have a couple of different options. An EPDM rubber coating product works for most RVs and is a weather-resistant elastomeric formulation that works really well. KST coatings are also a good choice since they feature a lot of the same properties and handle UV rays with ease. If you have a fiberglass roof, you’ll want something made specifically for that type of roofing material to ensure that everything is well-sealed.

Q: How many coats do I need to use to repair my RV’s roof?

Not as many as you think, since less is truly more when it comes to sealing up cracks in your RV’s roof. If you’re doing a complete coating, the number of coats it takes to do that will vary depending on the product type you’re using, and also on the type of RV you have. For instance, urethane and acrylic coatings require the use of a primer, as well as several coats overall.

Q: How does sealant differ from coating?

The quick and easy answer is that sealants are typically used for repairing cracks and sealing up roof joints to prevent water leaks, while coatings cover the whole roof and work as insulators and weather protectors. They can be used together or separately.

Q: What can I use to clean the roof coating once it’s applied and in use?

You can use a number of different detergents and cleaners, but keep in mind that anything containing petroleum, harsh abrasives, or citrus ingredients will damage the coating. When it comes to how frequently you should clean your rubber roof, about three to four times a year should do.

Q: Can I use a pressure washer to clean my RV’s roof?

Using a pressure washer before coating your roof is a great way to get rid of any build-up and lingering dirt, but once the coating has been applied, you should stick to gentler streams of water for cleaning purposes. Pressure washers can damage the seals, the coating, and even the paint job.

Final Thoughts

Heng’s Rubber Roof Coating earns our top spot for maximum adhesion that allows for an airtight coating on the roof. It helps to seal leaking roofs and resists damage from exposure to the sun. If you only have small leaks at the edges, then you can save some money by only getting the Dicor EPDM Self-Leveling Sealant. It’s great for sealing small leaks.