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Is Flex Seal Good For RV Roofs?

Published on December 20th, 2021 by Emily Lawrence

RV roof aerial view - cover photo for Is Flex Seal Good For RV Roofs?

Is Flex Seal Good For RV Roofs?

If you’ve ever tried to make home repairs or worked on an outdoor project, you may be familiar with the Flex Seal family of products. These include a range of adhesive tapes, sealants, and sprays that are tough and waterproof. If your camper’s roof has started to leak or tear, you may be wondering, “Is Flex Seal good for RV roofs?”

Although the Flex Seal family has some great products, this isn’t a simple yes or no answer. There are a lot of angles to this question that have to be considered such as the RV roof material, the type of damage you’re dealing with, and the size of the damaged area. Flex Seal won’t make the problem worse, but it might not always be the best product to turn to.

Let’s explore this issue further below. Some people swear by Flex Seal as a cure-all product, while others have been unimpressed. It really all comes down to the problem you’re dealing with and how long you need the solution to last.

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When to use Flex Seal

Although Flex Seal products are quite hardy, they aren’t a perfect solution to every problem. There are times and placed to use it.

First of all, make sure your RV roof is compatible with Flex Seal products! Most of them will be because these sealants work with fiberglass, metal, EPDM rubber, and TPO. Unless your roof is made with some other material, you should be safe to use Flex Seal on it.

Next, you need to consider the size of the damage. If you’re dealing with a small rip or hole, Flex Seal is a wonderful solution! It’s perfectly suited to mending small areas and will form a watertight seal. But is Flex Seal good for RV roofs of all sizes? No.

Flex Seal isn’t designed to be used over large surface areas. It’s better for fixing small imperfections. If you spread it too thin and over too wide of an area, it will lose some of its effectiveness. If it’s the only thing you have on hand and it’s an emergency, you can use as much as you need to. Just be aware that this isn’t what it was designed for.

As an emergency solution, it’s a good idea to carry a container of Flex Seal in your RV repair supplies. This may not be the best long-term fix, but it will help you patch cracks and holes in the RV roof before they can get worse. These products have proven to be great stop-gap measures that will keep your RV secure and dry until you can get professional help.

Best types of Flex Seal to use for RV roofs

If you’d like to keep some Flex Seal products on hand for emergency roof repair, that’s a good idea. There are different forms of Flex Seal, and some might be better than others for your situation. There are 4 main products that are useful for RV roof repair. These include Flex Seal Liquid, Flex Seal Spray, Flex Shot, and Flex Seal Tape. Each form has its own pros and cons, so let’s explore each of them a bit!

Flex Seal Liquid

This product is a thick, dark liquid that can be easily spread over an RV roof. Once it sets, it will form a waterproof rubbery seal. If you need a stop-gap product that can be used over larger areas, Flex Seal Liquid is your best bet. It’s easy to apply and comes in large quantities.

Flex Seal Spray

The Flex Seal Spray is essentially Flex Seal Liquid in an aerosol can. It’s easy to apply to hard-to-reach surfaces and forms a similar seal. It can be a bit harder to get a thick seal with this format, but it’s an easy way to make a surface much more water-resistant.

Flex Shot

Flex Shot is essentially Flex Seal’s version of caulk. It comes out in a thick, easy-to-control flow that you can guide along cracks, edges, and corners. This product might be best for interior fixes or clearly-defined roof cracks. It doesn’t spread quite as easily as the liquid or spray, so you should only use Flex Shot on small areas.

Flex Seal Tape

Finally, we have Flex Seal Tape, which might be the most well-known product of this company! It was famously used to mend a boat that had been sawn in half, so you can rest assured that this tape is strong and waterproof.

Obviously, this tape is best for small fixes as well. It would take a lot of time, effort, and money to cover an entire RV roof in Flex Tape, and you might have a hard time getting it off when you take it in for professional repairs. Because it is so strong, it has the potential to rip up the roof material once it is removed, so it may cause more damage in the long run.

If you’re choosing Flex Seal products that are good for RV roofs, Flex Seal Liquid and Flex Seal Spray may be your best options. To view the entire family of products, visit You can also find them on Amazon.

Flex Seal Alternatives

Some people have had stellar experiences using Flex Seal for all their roof problems, while others have found that it doesn’t suit their needs. Luckily, when it comes to roof repair, Flex Seal isn’t your only option. There are some sealants that were made specifically for mending and protecting RV roofs!

For instance, you may want to consider bringing along some RV Roof Magic. This liquid product was specifically designed with RV roofs in mind. It doesn’t require a primer, dries within hours, and provides stellar waterproof protection. You can also use it over large surfaces, not just for small fixes.

Other good products include:

So now we know that Flex Seal is good for RV roofs, but it’s not always the best option. There are other products that you may want to keep on hand specifically for roof repair, but Flex Seal products are great for many purposes! They’re tough and versatile, so it never hurts to keep some on hand.

Is Flex Seal good for RV roofs?

Make sure you keep track of all your RV maintenance and repairs with an online tool such as RV LIFE Maintenance. Not only can you keep all of your documents in one place, but you’ll also receive timely reminders when maintenance is due to help you avoid costly repairs and potentially serious accidents.

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26 thoughts on “Is Flex Seal Good For RV Roofs?”

  1. Flex Seal is a Gimmick product & does not last. I learned the hard way. Cost me more more & extra time when the RV Repair I made leaked. Flex Seal does not last in the sun. Apparently it has zero resistance to UV. I will never use any flex Seal product ever again.

  2. I have a 1980’s Trailer that had an EDPM roof …. Thru lack of maintenance of prior owners the EDPM was worn off completely other than under things like the Antenna. The rest of the roof was down to I believe rubber it was all Black. I was going to use Dicor to recoat the roof however the black (rubber)
    wouldn’t clean off. The trailer stays at a Campsite year round . So it never gets moved. I ended up using Flex seal 1 gallon white covered almost the entire roof the rest I used a spray can on. Its not worth replacing the roof. So If that doesn’t work… I will be looking for another camper. The last one I had had an aluminum roof that was easy to care for and only had a leak once from a tree branch piercing…I fixed it with what the local RV dealer suggested and it was fine. I only got rid of it as it was a Bit too small and this newer one has a separate Bedroom…. Anyway since it stays in place hopefully this buys me a few years. Its in a camp for motorcycle riding and not sure how many more years I will be able to ride. Otherwise I would definitely replace it. I have a Tiffan MotorHome for (camping). which has a fiberglass roof to me that is by far the best roof material. It still needs to be maintaned though…

  3. Used flex seal spray for a minor leak on the roof of what used to be my motor home. The next time it rained the whole roof leaked so bad that it flooded the whole inside! Had to junk the motor home!!

  4. Eternabond should be a must to have on hand. It stops leaks for many many years without maintenance.
    I put Eternabond over every seam where there is caulking. I no longer have to worry about caulking getting hairline cracks that allow water intrusion. Caulking is so yesterday, constant maintenance and you cannot see when cracks in the caulking are there.. I use Eternabond before I have a problem and if I should need a repair or I installed something on the roof I will Put Eternabond tape over it. It lets me sleep well.
    I do not work for or get any commission from Eternabond….Just a very satisfied customer.

  5. As an Certified RV Technician and have been working on RVs for over 7 years I have seen what all kinds of flex seal products preform after months of use. It starts with UV damage. The tape is the worst about it, after a couple weeks it starts to bubble and crack then it will turn to a rubbery putty. This stuff is borderline impossible to get off. Not only that but I have fixed leaks where flex seal products were used that looked like they were sealed but were leaking because it did not adhere to the roof. If you use this stuff to fix your roof be advised ITS NOT A PERMANENT FIX. It will have to be scraped off eventually. A lot of misconceptions I hear from customers is that you only need to seal when a leak is suspected. This can’t be farther from the truth. Either you or a professional needs to get on that roof at minimum of every year and inspect the seals. If any issues are found they should be sealed with the proper sealant for the issue. The products pretty much every shop uses are Dicor Self Leveling Sealant For roof applications and Proflex or SikaFlex for vertical applications. If you have a hole in your roof you can use eternabond roof repair tape. It’s not a permanent solution to some holes but it’s as close as it gets short of replacing the roof. Finally your roof does not last forever. Typically a rubber roof will have to be replaced every 5-12 years depending on maintenance. Every year the roof should be washed with roof cleaner then uv treated. This is the best way to keep your rubber membrane in tact it will also help keep your roof accessories in tact too. You don’t have to believe me when you take your rv in for a reseal don’t be surprised if you get a call telling it’s going to be more because the flex seal is so hard to remove. I suggest to my customers every 3 years to scrape and seal the whole roof to make sure it stays perfectly sealed.

    • Thank you so much for this information! I camped as a kid with my parents, but it’s all me now, so I want to do the best I can.

    • Thanks for the professional advice. I found it very helpful. A couple more questions. What do you use for uv roof treatment?
      Also, the screws holding down my roof accessories are rusted. What do you recommend to remove the rust and reseal the roof accessories?

  6. DO NOT USE IT ON YOUR RV AWNING….it destroyed mine, I had some pinholes on the upper edge that is always exposed, I figured I would try the Flex Seal Spray, it made it rock hard and brittle, could not roll it up properly after…I will never buy or endorse this product again. Big waste of money.

  7. Flex Tape & Flex Seal are ok, I’ve tried both. I’ve also tried Eternabond Tape (on Ebay). As the article says, determine the best tape for the application and what’s best for you.

  8. As a service advisor in the RV industry, I advise you to never use Flexseal for your RV. Use the proper sealants like Proflex RV for sides/corners and windows and Dicor Products lap sealant (self-leveling and non sag) for roofs. These products are designed specifically for RV materials and are formulated to have better elasticity and durability.

    • I have found that it does not stand up to sunlight. UV protection? I used it on our sunroom roof and it cracked with in the year.

  9. I did try flex seal on my leaking roof. The paste did not work well meaning it was difficult to spread. The spray cans work very good. I used it to seal the edges of roof repair tape and it did the trick. Unfortunately I spent the next 3 weeks fixing the damage in the floor caused by the leak!

  10. If and only if there was NOTHING else available and if it was a monsoon would I ever use flex seal again. It wl not adhere long term to “any” material even with tbe correct cleaning/surface preparation.
    I have tried it twice and it goes on smoothly, it looks great right after applcation….then in 2-4 weeks in tbe blistering sun it starts catestrophic cra king and peeling and your leak is back.
    The BEST rv sealer is Henrys Tropi-seal. It applies very easy and IT LASTS 2 YEARS even in the Oklahoma sun and wind.

    Do yourself a favor and walk past Flex Seal at walmart.

  11. You did not say anything about flex paste this stuff is really good sticks really good and I think it’s a permanent solution cuz you can add more

  12. Thanks for the article. One thing that isn’t mentioned is whether FlexSeal is UV resistant. As near as I can tell the paste is, but their ads seem to engage in a little tricky wording when it comes to the spray, saying it will “keep UV light from penetrating”. Well, so will mud, but it wouldn’t caulk my roof with it. Will it crack and/or yellow with time? I suppose they all do eventually. A sealant in a spray can seems like it might be convenient for sealing seams around vents and skylights, but something that has to be scraped off and reapplied regularly would be more trouble than it’s worth.

  13. We bought a 1984 Yellowstone 5th wheel with an aluminum roof. The previous owner had used tar to patch and seal.
    Spray on Flex Seal can NOT be used over tar and last.
    We were told it would and ended up with a cluster. I spent approximately 16 hours cleaning off the cr@* ?just around the escape hatch.
    After cleaning down to the alum roof we used Dicor and that has worked very well.
    Hats off to Dicor product. Thank you for saving our bacon Dicor. I now have to work on cleaning off ALL the tar and Flex Seal we sprayed on so I can seal up the edges.
    I will say their tape is an excellent TEMPORARY fix.

    People who use these things on RVs are like people who take horse pills because they are cheaper.
    Using Flex Seal on your RV will only cost you more in the long run.
    Use ONLY products designed for RV application.
    P.S. : NEVER COAT A RUBBER ROOF even though the coating is designed for RVs roll on coating only make finding future leaks harder.

  15. There’s a very significant point that needs to be addressed: as long as I know the FlexSeal family of products is SILICONE BASED, and that is a deal breaker for any actual repair on an RV because wherever silicone touches it inhibits the adhesion of anything afterwards. So if you make just a temporary repair you wont be able to actually fix it with the actual product…
    Because of that I’m using products that qualify as “paintable” in their label, I had good results with the “liquid rubbers” of both Gorilla and RustOleum.


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