Can I Use Flex Seal on My RV Roof?

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I have had many people ask me the question Can I Use Flex Seal on My RV Roof? In fact, I’ve asked myself that question once or twice. So, I decided to find the real answer once and for all. The short answer is – yes, you can use flex seal on your RV Roof! However, you do need to go into this with your eyes open.

Your new RV is your ticket to many grand open-road adventures. Therefore, it is essential to take good care of your RV. Proper maintenance will ensure you get many years of trouble-free travel from your investment. However, even the best RVs are susceptible to problems caused by normal wear and tear or even accidental damage.

One particularly damaging and costly repair issue for RV owners is a leaking roof. A leaky roof will quickly lead to other water damage problems and significantly decrease the resale value of your RV should you ever decide to sell it or trade it in. Therefore, the faster you can effectively stop a leak in your RV roof, the better off you are, period.

Can I Use Flex Seal on My RV Roof
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Types of RV Roof Repairs

It is important to remember that there are different kinds of repairs you may need to consider depending on the situation in which you find yourself. Are you home from a recent trip and have discovered a possible problem with a roof seam.

Or, are you miles from anywhere with a severe leak during a monsoon season. The situation you find yourself in may also determine what RV roof repair or sealer products are best, or even appropriate.

First, there is the permanent repair. Often this repair will be performed by an RV repair service or a dealer. It will take a reasonably long time to complete and will be quite expensive. However, if you are a do-it-yourself kind of person, there are products available to completely and permanently repair your RV’s leaking roof.

Second, you have a roadside repair emergency. For example, you are staying in a remote campground in the wilds of Nevada, and a tree limb falls on your RV roof, creating a leak. A leak like this is something you need to repair right away. And, often this kind of repair will be temporary.

It is important to note that this second type of repair should not be considered permanent. It is a repair designed to fix the leak and buy you time to plan and schedule a permanent roof repair.

Emergency RV Roof Repairs

A leaking RV roof is something that you need to fix immediately. The longer a leak continues, the more water damage will occur, and the higher the cost of any future repairs will be. When you discover a leak in your RV roof, you will need a way to quickly and effectively stop the leak. And you will probably need to do this with something you can carry with you in one of your RV’s storage compartments.

In a situation like this, one way to stop the leak in your RV’s roof is to apply a durable and waterproof sealant over the leaky area. There are many new rubber coating products on the market today. The question is, which might be the best suited to fix the leak in your RV. Flex Seal is an excellent option to consider. However, as with any product, Flex Seal has its limitations. And, there are some advantages and disadvantages to using this product.

Advantages of Flex Seal

Flex Seal provides a low-cost option for an otherwise costly repair. Repairing a roof is going to cost much more than using Flex Seal. It dries fast and seals leaks within minutes of being applied. Flex Seal is readily available at a range of retailers and is perfect for quick fixes while on the road until a more permanent repair can be arranged.

Disadvantages of Flex Seal

Flex Seal is a temporary fix and not a permanent solution to a leak. Flex Seal should not be used to repair a whole roof. When there’s a lot of roof area to cover, you will want to consider other options.

Four Types of Flex Seal and How to Use Them On an RV Roof

Flex Seal comes in three forms: Flex Seal Liquid, Flex Seal Spray, and Flex Seal Shot. Flex Seal Liquid and Spray both come in black, white, and clear. Flex Shot comes in white and clear. The great thing is that you can use Flex Seal with many all RV roof materials.

Flex Seal Liquid

Flex Seal RV Roof Products

Flex Seal Liquid is liquid rubber in a can and, it will stop leaks fast. Flex Seal will protect your RV’s roof surface from corrosion. It also will not melt, peel, or crack because of harsh weather conditions. Being a thick liquid, Flex Seal is incredibly versatile and can be rolled, dipped, brushed, or poured on surfaces. When it cures, you will have a waterproof layer of sturdy, flexible rubber.

Flex Seal Spray

Flex Seal Spray is the most commonly used spray-on liquid rubber sealer available. The convenient aerosol spray allows for the easy application of Flex Seal with no brushes or rollers required. However, be careful with the overspray. It can be a bit messy.

Flex Shot

Flex Shot is a perfect solution for those tight, hard-to-reach places. It is ideal for caulking around your windows or air conditioner, etc. It’s straightforward to use and will stop flowing the minute you release downward pressure on the bottle.

Flex Seal Tape

Flex Seal Tape can be applied to the leaking area of a roof before using one of the other flex seal products above. For example, the tape is perfect for a tear in your roof that could be caused by hitting a tree branch.

What Kind of RV Roofs Can Be Repaired with Flex Seal?

There are two primary materials designed and used specifically for RV rubber roofs. They are EPDM and TPO. Both TPO and EPDM are classified as rubber roofs, but they are a bit different in form and appearance.


TPO RV roofing is the most popular option for RV roofs in use today. It is a popular choice because it is inexpensive to buy and it’s white. The TPO membrane has a shiny, laminate appearance with the outer layer having a plastic look and feel to it. It can either be fitted with screws or otherwise mechanically attached. It can also be glued down. When it comes to detailed work and seams, both glue and heat can be used to create a seal.

EPDM Rubber Roofs

EPDM is a second popular option for RV roofing. It differs from TPO in several ways. EPDM is a synthetic rubber material that can be vulcanized. This means it can be dried and cured to form sheets. Alternatively, you can also use EPDM in its un-vulcanized form. In this form, it’ll never completely solidify. It’s relatively common to use both EDPM types together for an RV roof. Vulcanized EPDM would be used for the roof membrane, while non-vulcanized EPDM can be used for any flashing or detail work. EPDM rubber roofs are usually maintenance-free for about ten years, but they will oxidize over time.

Fiberglass Roofs

Fiberglass is becoming a common RV roof material as well. Fiberglass RV roofs, like EPDM roofs, will oxidize over time. Newer RVs with fiberglass roofs have a clear coat finish on them which does slow down the oxidation of your RV’s roof.

Metal RV Roofs

Metal was the preferred RV roofing material until TPO and EPDM showed up on the scene. Flex Seal will adhere to almost any surface including wood, metal, aluminum, plastic, fiberglass, rubber, vinyl, or just about any dry (or even wet) surface. You just need to be sure to clean your RV roof before applying Flex Seal. It does work best on dry surfaces, but if you are dealing with a leak during rainy weather, you can still stop the leak.

How to Use Flex Seal 

A leak in any of these RV roof materials can be repaired using Flex Seal. Again, the important thing while on the road is to stop the leak and prevent further water damage. Flex Seal is an excellent product for that purpose.

Once you have completed your trip and you are in a position to schedule and complete a more permanent repair, you should go ahead and do so. Flex Seal is an excellent temporary fix for your water leak, but it is not a permanent repair.

Does Flex Seal Work as Well as Dicor Lap Sealant?

Dicor Lap Sealant is another often recommended option to repair RV roof leaks. Dicor Lap Sealant is a self-leveling compound which is applied in a bead that will then spread and seal the leak. By most accounts, Dicor Lap Sealant works well and is an excellent product.

The drawbacks are that Dicor Lap Sealant requires careful prep work and the proper temperature conditions to level and seal properly. This prep work and ideal temperature condition may not always be possible or available during an emergency repair while touring the Alaskan wilderness or a desert in the Southwest.

You can find various opinions on both Flex Seal and Dicor Lap Sealant as to these products performance and reliability. When you have the time and right tools to properly prepare the leaking area for repair and the right temperature to allow Dicor Lap Sealant to level and seal the leak, it is indeed the better product.

However, when you are pulled off on the shoulder of the Trans-Canada Highway with a leaky RV roof, and the storm clouds are brewing, having a few cans of Flex Seal Spray in one of your storage compartments might be just the thing you need.

What Have We Decided About Flex Seal RV Roof Repairs?

Many RVer’s have used Flex Seal for repairing leaks in their RVs. From reading RV forums, it is clear that some were very happy with the results while others had nothing good to say.

Relying on Flex Seal as a permanent solution to a leaky RV roof may not be a good idea. It could be argued that Flex Seal is not designed for RV roof repairs. However, many of the negative reviews seem to stem from those expecting Flex Seal to be a permanent repair.

The ready availability of Flex Seal at major retailers, as-seen-onTV stores, and online, makes it very easy to keep a few cans of Flex Seal Liquid, Spray, or Shot on hand for emergencies. It might not hurt to have a roll of the tape as well.

Flex Seal is also relatively inexpensive. You can apply it on almost any surface, in cold weather, hot weather, on dry surfaces, and wet surfaces. It does stop leaks and will certainly get you to a point where you have the time to shop for a more permanent roof repair for your RV.

Personally, I keep a roll of Eterna Bond Tape, Dicor Self Leveling Lap Sealant Caulk and another tube of Dicor Non Sag Lap Sealant Caulk on board my RV for any emergency repairs I have to make. I’ve used flex seal and although I think it worked, it was really hard to work with. Have you used Flex Seal to make a repair on your RV Roof? Please share your comments about it below. You never know but your comment could help a fellow RVer!


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47 thoughts on “Can I Use Flex Seal on My RV Roof?”

  1. Hubs used it on our 1985 Komfort which had a leak and for three years now, no leaks at all. Would recommend it for all RV roofs.

    • Hi Kay,

      Glad it worked for you and your hubby!

      Thanks for reading the blog and for your comment!


  2. I have used Flex Seal around a skylight vent. Peeled off the material that the manufacturer had put on and painted on the liquid version.
    It is going on two years now and still looks and feels tougher than the original material.

    • Hi Scott,

      I’m impressed that the FlexSeal has lasted two years and thanks for the feedback!
      That’s good to know.


  3. This is a great site. Good info. I bought a used camper. The roof material has worn down so that there is no longer any white surface left. It’s all black! What product can I use to resurface the whole roof??

    • You could try liquid rubber roof but you may have to just replace it.

  4. I like you have used & keep a roll of Eterna Bond Tape. I have a patch on the roof vent attachment border & front corner of a metal roof. It has lasted 5 years & shows no signs of any deterioration. Glad to hear that flex seal is a good option. You never know.

    • Hi Earnest,
      Wow 5 years is great for a roof repair!
      Eterna Bond works wonders.
      Thanks for visiting the website and reading the article.

    • It’s time to roll a new coat on my rv rubber roof. I have no leaks is flex seal a good product to use on your whole roof?

      • Hi Mike,
        Great question. Well as I mentioned in the article and the YouTube Video I think Flex Seal is a great product to use for a temporary repair. Since you are looking to make a more permanent roof seal I would recommend using a product specifically designed for your type of RV roof.
        Thanks for asking!

      • yes ! We have a Lifestyle 5th wheel and put it on right when we bought it new 3 YEARS AGO. It worked wonderful and we live in AZ fulltime….HOT. Used 3 gal on a 36 ft roof, mark off 3 sections then roll each gallon on. Used a brush to do around the AC units etc. Husband checks it every year and it is excellent. Really great stuff….be sure to start in the far end and roll toward the ladder…lol.

  5. Awesome! You always go one step beyond when you write your articles.

    There is so much great, useful information here. Thank you!


    • Thanks Ash,

      I really appreciate the kind words and I’m very happy you found the info to be helpful!


  6. I had to replace a broken plumbing vent on my 5th wheel. When removing the old vent and the old sealant the wood roofing shows. Do i need to put something down before i apply the Dicor self leveling sealant?

    • Hi Jennifer,

      You can use the Dicor Self Leveling sealant right on the wood. And actually, nothing sticks better to wood than Dicor so you should be good to go!
      Good luck and thanks for reading the article!

  7. Good morning everyone I’ve used the flex seal around some edges and skylights so far so good what I want to know is there anything to use besides dicor prep to prime (get it clean ) before using dicor.?

    • I do not recommend any petroleum products at all if you have a rubber roof because they can damage your roof.- but denatured alcohol should be safe and do the trick.
      Thanks for reading the article!

  8. Rightly said, a leaking RV roof is something that must be fixed immediately. The longer you wait for the more water damage will occur. Identifying roof leaks can be difficult and may over time reoccur. So, why not choose Liquid RV Roof and stop worrying. It is a cost effective, easy to apply and works extremely well on water leaks and punctures.

    • Hi Nicole,
      I am finally letting your comment go through – Liquid RV Roof is certainly a good solution for roof leaks too!

  9. I used Flex Seal on the first foot of my awning. It was starting to degrade and you could see pinholes starting to develop. The Flex Seal provides protection from the sun, fills the pinholes, and strengthens the awning. Been 2 years and looks good

    • Hi Dave,
      I’ve never even thought about using Flex Seal on an awning!
      What a great idea!
      Thanks for sharing!

      • I used spray flex sealmon my awning. Worked great. I used flexseal on a corner of my rv due to water damage. Help up 5 years

  10. I used Henry Tropi Cool on my Roof before renewing seals. I had to clean all sealants off with Denatured Alcohol because nothing stayed on the Silicon Roof. I resealed all Roof with Dicor self leveling . .Its still soft to the touch after 3 days. Can I reapply another coat of Tropi Cool (100% Silicone) ? If I paint over the Dicor sealant is that good enough for not letting water into the sealed areas? No tape will stick to Silicone I found out the hard way.

    • Hi Angela,
      I don’t recommend silicone on your roof at all so I’m not sure where you would go from here…

  11. I have a 2019 Landmark by Heartland. From the ground level looking up there appears to be either wrinkles or air bubbles in a few areas next to the trim line on both sides where the roof meets the painted fiberglass. I am a disables veteran and can not get on the roof to see it any closer.

    Would flex seal white tape prevent any further threat of a roof leak? Rubber roof.


    • Hi Myers,
      I only recommend Flex Seal for temporary repairs although plenty of folks say it lasts years. I have not had that experience with Flex Seal myself. If you need a cheap fix perhaps Eterna Bond tape would be a better choice.

  12. I just saw your info. Great information and clearly stated.
    Will be reading your posts.
    Thank you from the Great state of Texas

  13. I have a motorhome with a fiberglass roof not leaking but chalking badly, 20 years old. Would flex seal work on entire roof?

  14. Can i use a thin layer of self levering sealant on Entire rv roof ?and will i be able to walk on the roof after it cures or will it stay sticky

  15. I’m not an RV owner…..YET. I really want to be, so I’m doing all of my due diligence and researching RV repair and maintenance so I’ll have some idea of what I’m getting into. Thanks so much for this article, it (and the previous comments) has been most helpful!

    • Hi Holly,
      Glad you liked the article and some of the comments by our readers!
      Let us know if you ever have any questions!

  16. Will flex seal adhere to silicone? Prior owner smeared silicone caulk to make a roof repair

    • Hi Vince,
      I would recommend removing the silicone. I don’t think Flex Seal will adhere to it.

  17. This is an excellent article as well as the comments and answered several questions I have had in regard to RV rubber roof repairs. Thank you very much.

    • Thanks Larry,

      Glad you found the article and the comments helpful!


  18. waiting for new skylight to arrive and install. Have crack on 3 out of 4 corners and some wet weather expected before the new one arrives. Was going to try using Flex Seal clear Spray on corners and a temporary fix. Should I scruff the corners with fine sand paper before applying? or if you have another suggestion, I am open ?

    • Hi Dee,
      It will hold a little bit better if you use the sandpaper on the skylight.
      Thanks for reading the article and for your question!

  19. Hello, and thank you for your article.

    We have a 95 Jayco that we bought from a friend for a super low price. It had been sitting about 8 years plus in their back yard.

    Knowing nothing when we started this process, we pulled it home and started to remodel inside to make it ours. We soon discovered lots of new leaks and realized the roof had become quite “crispy”. We used flex seal over the whole roof after replacing materials up there and inside. Tarped it worked slowly on the remodel. Two years later we are finally camping and loving it. Then it rained heavy for a few days. At least 6 leaks.

    My hubby is thinking flex seal again, but after reading your article I am wondering what our next step should be.

  20. I have a 1997 Jayco Designer Series smooth side 31′ fifth wheel. I had a persistent leak from the roof when raining from a certain direction. Eventually figured out it was coming from the old roll up winegard antenna. I remover the antenna completely (no use for it) cleaned up the plywood and cut back the loose part of the epdm roofing to where it was still attached to the plywood. I put down two layers of white flex seal tape, and then I leveled the area off with white flex seal paste (hint, dip your spreader in water when you are doing the final smoothing of the paste). It sets up fast, the repair was 100% water tight, and when I go back this fall, plan to coat the area with two coats of white koolseal roof coating (which also works great by the way). I have also used the flex tape along the seams of the slide out roof to replace old seam tape. Works great there as well. Once it takes a set, you can not pull that flex seal tape off. Highly recommended for both temporary and am thinking it looks promising for a permanent repair as well.

  21. I do not have a leak yet in my trailer, however I believe an ounce of prevention is worth a pound of cure. In this case I have used Flex Seal white liquid rubber in the gallon size and I have coated the top of my trailer roof as an extra layer of sealant and protection for my ‘Home away from home.’
    I am with you wholeheartedly when I say Flex Seal is not a permanent fix to a roof leak or repair. But rolling a layer on the entire surface, paying attention to cracks,openings and already sealed air vents, A/C and & other openings and corners in the roof makes perfect sense to me. It adds another coat of water proofing and prevents UV damaged caused by the sun. It penetrates and fills small cracks waiting to expand and get bigger with expansion and contraction of temperature extremes caused by the weather. If nothing else, it is an $89.99 can of peace of mind.

  22. I had used the Flex Seal spray on a few spots on my rig, but discovered a rather large leak(s) where the front panel meets the roof. It had been raining very hard, but eased up to a sprinkle and it was just above freezing, so I went with the Flex Seal liquid. Things were much better, until. . .

    A few weeks later, when the almost 100 mph winds came through our area – they peeled the Flex Seal liquid right off the roof in chunks over a foot long and a few inches wide. I also lost a few patches where I had used the spray.

    Looking at the pieces that tore off, it looks like cleaning the roof was insufficient, as a very thin dusty/papery layer of the degraded roof (we’ve been full-timing in this rig since 2004) came off with the Flex Seal.

    I have seen denatured alcohol repeatedly suggested at a safe and effective cleaning agent. Is this the best choice, or are there other options. Do I need to lightly sand (best grit?), too?

  23. My fiberglass roof has multiple leaks and the roof has delaminated from foam. (I have a Gulfstream BT Cruiser. I just bought and found damage after I got it home)

    The bottom of the luan is soaking wet. Would you suggest I tear out the foam and let it dry out and seal the top with Dicor and kool seal or replace all the fiberglass with TPO?

    • Hi CJ,
      You may have to replace the wet luan before anything else…I think replacing the fiberglass with TPO might be a good idea…you could also take it to an RV mechanic and get some advice too! You might still do the work yourself but at least you will have a good idea of what todo.

  24. Hello Mike, I have a model home
    trailer with shingles. Wondering would I be able to use one of the clear flex seal on the shingles if I
    had a leak?
    Thank You for Reading.


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