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7 Best RV Sealants & Caulks for Your Roof (2022)

Find the best RV sealant on this list to avoid costly water damage…

The integrity of an RV’s roof is as important as any other roof. Only when a roof of an RV leaks, there aren’t as many places to avoid the falling water!

And it’s not just your comfort that’s compromised after a leaky roof. Your wallet can be hit hard too with some serious water damage. Various materials like electrical could get messed up from roof leaks. Crossed wires could start a fire!

Not to mention the build-up of mildew and mold. Unwelcome fungi are not the best option for fellow travelers on a long trip. Many RV owners get sick this way.

In short, your entire roof needs water resistance. The best results for achieving a watertight seal to preserve roof material during inclement weather are to use a high-quality sealant.

7 Top Picks for the Best RV Sealant

What does sealant do for your roof? It seals leaks and cracks in their own specific ways, ideally to be done every year.

So what is the best sealant? Don’t worry because unlike your roof, my lips are not sealed. Read on to learn the best RV sealant for you to help make sure roof repair is not in your future.

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1 – Dicor Self-Leveling Lap Sealant

Dicor lap sealant is certainly one of the most popular types of sealant in the RV market today for good reason. It has a strong adhesion level on all types of materials, including vinyl, fiberglass, aluminum, and wood.

What does self-leveling mean? It means that when you pump the white color liquid sealants onto the existing surface, it will level itself without you needing to be so exacting with every drop.

It’s also a flexible sealant which means it doesn’t harden. By not hardening, it doesn’t crack, which makes it an excellent choice for cracks that might vibrate a little during use, such as roof edges. When dry, this Dicor RV caulk will even properly seal an EPDM rubber roof.

It’s just a good choice to have on hand in case different surfaces need some sealing up. Besides roof types, it can also cover holes and cracks in vent pipes, screws, and air vents.

2 – Eternabond RSW-4-50 Roofseal Sealant Tape

Tape sealants will also do a good job of patching up what needs covering. This one is made from a material combining rubber and resins.

You also can’t beat its ease of use. No messing around with a caulk gun here and getting your hands dirty leveling the liquid out along the cracks.

You just peel it and stick it. Just by pressing it down evenly over the area that needs sealing it will adhere for a long time without tearing. Plus, not dealing with liquid sealant makes it one of the easiest ways to seal your recreational vehicles.

It’s worth noting you are paying extra for this convenience though.

Aesthetically, you just need to accept that tape is more visible than the liquid versions. So this might not be the best product for you if the spot that needs caulk is visible to you and guests.

3 – Geocel ProFlex RV Sealant

Speaking of aesthetics, the Geocel delivers a great-looking finish. You can even paint over it later, and like the Dicor, the Geocel levels itself. The surfaces can even be damp, making this application process simple under most circumstances.

It even specializes in sealing parts in air conditioners and air compressors. This is important since these can be potential sources for pesky leaks as well. (Here’s an air-conditioning hack & upgrade you might want to check out)

Unlike the Dicor though, it can’t be used on rubber roofs. But for any other kind, it’s one of the most reliable and resealable RV roof sealant products.


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4 – Sashco Through The Roof Sealant

Impressed that the Geocel can handle a damp surface? You ain’t seen nothin’ yet with Sashco’s incredibly flexible and adaptable sealant. It can be pouring rain and this sealant will still be effectively mildew, water, and UV resistant.

(Or you could just camp in perfect weather all year round!).

It also works on just about all the different types of surfaces. Plastic, concrete, wood will stay moisture free and its integrity can even withstand freezing temperatures. It even results in some of the best caulk for vents, ducts, pipes, and air conditioning.

The Sashco is the best choice if you’re worried about an emergency happening where leaks can spring suddenly during outdoor use.

5 – 3M Marine Adhesive Sealant 5200

This sealant doesn’t use a “marine” label lightly. If you’re looking for the best way to keep a long-lasting seal through temperature changes and whatever nature throws at you, here’s your sealant.

It takes two days to dry. While you shouldn’t apply it during a rainstorm like you can with Sashco, it’s as strong and tough as they come once it dries. Even if an earthquake shakes your RV to kingdom come, this sealant is the most likely to stay bonded.

Even better yet, it lasts years. Most others last maybe a year. So if you’re someone who has the two days to apply sealant and then not think about it a long time, go with the 3M.

Still looking for the best RV sealant? Here are a few more.

6 – Beech Lane RV Permanent Repair Tape

Speaking of lasting a long time, the Beech Lane is a tape sealant that lasts years. This includes on just about any type of RV roof, including metal roofs and rubber ones. It even boasts lasting through any type of weather, including hail storms.

Just like the Eternabond, the Beech Lane has an easy application. It just advises installation above 48 degrees Fahrenheit, so don’t buy this if you live in a place below that number.

7- Heng’s Rubber Roof Coating

Heng’s Industries makes this great liquid rubber RV roof coating. It’s designed to seal seams, tears, vents, and other openings in RV rubber roofs. The material expands and contracts with roofs so it resists cracks when you’re RV’s bouncing down the road.

As it should be, it is also UV resistant. You’d think that be a given on roof sealants but you’d be surprised! You always need to check the labels.

Lots of RVers have been very happy with this product!

Your Vote on the Best RV Sealant

Do you have a sealant that works best for your RV? Any specific ones better for certain kinds of roofs or weather? Let us know in the comments!

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2 Responses to “7 Best RV Sealants & Caulks for Your Roof (2022)”

January 04, 2022at12:20 pm, Dale Jag said:

I’ve used the white “Flex Seal” on my roof. It adheres to the rubber roof like it was part of the roof. It filled in all the cracks and seams along the roof and I no longer have any leaks. It is UV resistant and looks like it will last a LONG time. In the past, I used the “Dicor” products for my roof. However, about a year later, you can see where it was washing away and the Black rubber roof began showing. Flex Seal has been on my roof for about a year now with the California Desert Sun and there is no noticeable wear. The only drawback I have seen is the water will build up and spot the roof. Soap and moping would be required to clean. Also, it is slipperier than the Dicor paint only when wet. Flex Seal looks like it will last for years without constantly doing repairs around vents and other seams. I wish I did this earlier.

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January 04, 2022at7:37 am, Juliana Ahearn said:

With regards to the article on roof sealants, why not just a new roof that is Guaranteed for 3 generations? For more info contact Double Duces. They have a Facebook page complete with photos before, during and after the new roof. You will be surprised at the level of damage inspite of the age, make, model or price of your travel trailer or top of the line RV. There is a Double Duces in York PA. Never climb on the roof again and keep redoing sealant, besides it’s dangerous.

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