Can I Use Flex Seal on My RV Roof?

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Flex Seal is a type of RV roof repair that’s fast, and effective on many types of roofs. Sure, you want to know, Can I use Flex Seal on my RV roof? It’s possible, but there are caveats and considerations to be aware of.

Sealing your RV roof is important to do once or twice a year. However, sometimes RV roofing issues require an immediate response. If you’re out boondocking and tens of miles away from civilization, then getting some roof repair materials to fix it up in a hurry won’t be possible. But if you have a handy can of Flex Seal stowed away, that’ll be usable in a bind!


RV Roof

Our related articles on RV roof maintenance, repairs, and replacement:

> Complete RV Roof Guide

> How Often Should You Seal Your RV Roof?

> RV Fiberglass Roof Repair

> Does RV Insurance Cover Roof Damage?

> How to Protect RV Skylights from Hail


Fast Acting RV Roof Repairs Using Flex Seal

When discovering a small hole in the roof or damage from an overnight storm, it’s important to get the roof fixed ASAP. Doing so will protect it from any further water getting inside the RV causing future moisture damage, the possibilities of growing mold or mildew, and costlier repairs later too.

Retail Store Access Not Always is a Given

You’re not always near a DIY store or a Walmart. Most people don’t think to have a can of liquid rubber or RV roof repair tape to fix the damage immediately. And this can create a bit of a dilemma.

Any future rainfall is going to let water in and create moisture problems. Existing roof damage will then worsen. RV insurance may not cover roof damage if it wasn’t fixed when first discovered. A camper or trailer left out and rained on again with a knowingly leaky roof isn’t going to have a successful claim.

It’s up to RVers to protect their investment by fixing their roof quickly rather than delay until the RV workshop has a repair booking available in a few days.

Flex Seal Can Be a Quick Fix Solution to Last a While

The range of Flex Seal products offers a way to buy it ahead of time and store it away literally for a rainy day.

Should a problem occur with the RV roof, then it’s possible to create an ad hoc fix that’ll seal cracks or basic roof damage quickly without needed extra tools or equipment.

The intention is that this will tide you over until a more permanent fix can be found when reaching an RV supply store. Meanwhile, additional damage is not being done driving through the rain with a damaged roof to get there!

Also, take note that using Flex Seal to fix an entire RV roof, due to extensive damage, is not the preferred option. See our seal your RV roof article to learn more.


Is Flex Seal Safe for RV Roofs?

The Flex Seal range of products is widely used by RVers to fix roofing problems and avoid worse damage from occurring in the short-term.

While a Dicor lap sealant is likely to be the better long-term choice, Flex Seal can be applied easily, quickly, and even in wet conditions or to wet RV roof materials. This makes it an excellent emergency standby solution to keep available for when it’s needed.

How Long Does Flex Seal Last on RV Roof?

While Flex Seal technically could potentially last for years, most people don’t use it that way.

It is petroleum-based. Rubber roofs (EPDM and TPO) don’t always play nicely with petroleum-based products. However, when needing a temporary fix before implementing a different solution at a later time, it’s a great way to avoid internal water damage in your motorhome, camper, or trailer.

Multiple Flex Seal Products to Choose From

Flex Seal is the brand and the company behind it has produced several products to perform quick RV roof repairs. Some are available in multiple colors whereas others are not.

Here’s our rundown of the different products for sealing your RV’s roof:

Flex Seal Spray

Sold in a convenient, compact aerosol can, Flex Seal Spray is easy to store and apply as needed.

The spray-on solution is liquid rubber that seals the roof well. It is a little tricky to apply it to just the right area, so it’s useful to use masking tape around the parts of the roof where you don’t wish the liquid rubber to end up.

Because it’s a spray, there’s no need for rollers or brushes. It’s also one that can be used fast in a situation where the roof is damaged, and an instant fix is required.

Flex Seal Spray Rubber Sealant Coating, 14-oz, White – FSWHTD20 (2 Pack)

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Flex Seal Liquid

The Flex Seal Liquid is well-known and there are other rubber liquid in-a-tin products on the market, making this one more familiar from an application standpoint.

How to apply flex seal liquid to roof?

As a liquid rubber, it’s possible to open the can and apply it to roof cracks, erosion, and so on. There’s the flexibility to pour it, use a brush, a roller, or dip a roofing section into the tin, and then stick it where it needs to go.

Once the rubber hardens, it forms a waterproof roofing layer to your RV.

Flex Seal Liquid Rubber in a Can, 1 gallon, White

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Flex Shot

Another alternative is Flex Shot. This product was designed for use on the roof to get around fixtures like a vent or AC unit.

This product is purposely designed to let you reach difficult spots that are awkward to access otherwise. It acts as a caulking-type solution to get into crevices and small gaps instead of lathering on a liquid rubber over the top of them where little reaches the crack itself to seal it better.

Sold in a bottle form, it is released by depressing the release to begin the controlled flow.

Flex Shot Rubber Adhesive Sealant Caulk. Resists Mildew. 8-oz, White (2 Pack)

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Flex Glue

Available in a convenient tube, the Flex Glue is designed as a strong adhesive that can almost immediately glue separated roofing materials together.

It works during both dry and wet conditions, and even underwater according to the manufacturer.

Flex Seal Flex Glue – White Max 28 Oz. Cartridge – GFSMAXWHT28

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Flex Tape

Rounding out the range is the Flex Seal Tape.

The tape is ideal for covering abrasions to roofing membranes or scratches from the limbs of a tree. With the scoring or gash not being expansive or deep, covering it over and sealing it using Flex Seal Tape might be all that’s required.

Also, it’s possible to apply one of the other 3 sealants, and then add this tape over the top once the solution has cured/dried.

Flex Tape Rubberized Waterproof Tape – Clear (8″ X 5′ and 2.6 lbs)

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Using Flex Seal on Different Roof Repairs

Different results are likely when using a Flex Seal sealant on a camper, trailer, or RV roof. They won’t all perform as well or last as long, so it’s important to know your roof type, so you can set realistic expectations.

Flex Seal on EPDM Roof

EPDM roofs are the second most common RV roof type.

Flex Seal can seal up an EPDM roofing membrane that’s been damaged or go around RV roofing fixtures that now have leaky seals.

Flex Seal on TPO Roof

TPO roofs are white and so it is best to get a white version of a Flex Seal sealant product to match it as closely as possible.

These types of roofs are shiny and laminated. A spray-on sealant like the Flex Seal Spray is likely to result in a more seamless appearance.

Metal RV Roofs

After hail damage on a camper, it’s possible to sustain pockets of significant damage to the roofing materials. Pretty soon, you’re asking does RV insurance cover roof damage?

Flex Seal works fine on metal materials, so it will stick to a metal RV roofing solution to seal a hole or temporarily resolve damage that could let in water.

Fiberglass RV Roofs

When dealing with an RV fiberglass roof repair, specialized roof repair supplies are often required to handle this composite material.

However, because Flex Seal functions well on wood, glass, metal, and other build types, it also works as a temporary solution on fiberglass campers or trailers too. Furthermore, the fiberglass could still be wet from a storm. In which case, the fact that the product sticks to wet surfaces (not only dry ones) is all for the better.

How to Use Flex Seal to Fix a Damaged Roof

Whether it’s sprayed, poured, brushed, or rolled on depends on the Flex Seal product that you have to hand when the RV roof became damaged.

It’s best to dry off and clean the area where you’ll be applying the product. This gives it the best chance of providing an effective RV roof seal until you can get to a place to implement a more permanent one.

Should You Use Dicor Lap Sealant Instead?

We commonly recommend Dicor Lap sealant as it is self-leveling and reasonably simple to use.

It does require a little preparation first, including giving that part of the roof a serious clean to get the best results. Also, it needs a more limited temperature range and mostly dry conditions to create an effective seal. These are not always conditions that you have available at the time.

We feel that Flex Seal is useful when an urgent or emergency RV roof repair is required. The Dicor lap sealant is more of a long-term solution once you’re back to a place where a proper RV roof repair can be performed under overhead cover where there’s no additional risk of water intrusion while it’s underway.

Dicor Self-Leveling Lap Sealant – 501LSW-1 (4 Pack)

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Closing Thoughts

Flex Seal is an excellent range of RV roof repair products to solve short-term roofing damage. Keeping a spray can or another version of this product inside your camper, trailer, or motorhome gives you rapid roof repair options to save your RV after the roof has sustained damage. This could potentially save thousands in repair costs and considerable inconvenience to your RV travel plans too.

It’s probably best to look for a more permanent RV roof repair solution once you can access other roof repair materials or book a repair with an RV workshop.

Related Articles

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