Flex Seal For RV Roof Applications

Estimated reading time: 14 minutes

Dealing with a leaky RV roof can turn your road adventure sour in no time. Flex Seal boasts a quick fix reputation for those pesky leaks and damages. This article will guide you through the dos and don’ts, ensuring that your mobile haven stays dry and cozy.

Ready to seal the deal? Keep reading!

Key Takeaways

  • Flex Seal is a simple way to fix small RV roof leaks and can be applied even in wet conditions.
  • For bigger or more permanent repairs, products like Dicor Lap Sealant and EternaBond Tape are better because they handle sun exposure and RV movement well.
  • Regular roof maintenance and using the right product for your needs will help keep your RV dry on your adventures.

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What is Flex Seal?

A person fixing a leaking RV roof with Flex Seal in the rain.

Flex Seal is a liquid rubber sealant coating that promises to stop leaks fast. It’s like having a handyman in a can. This thick, durable liquid forms a flexible, waterproof barrier when it dries.

RV owners love it for quick fixes on their roofs because it sprays out as a liquid. That means it seeps into cracks and holes, then dries to a watertight, flexible rubberized coating.

You can use Flex Seal on wet or dry surfaces, even underwater! It’s perfect for all types of weather conditions. Easy to apply, this product comes in different forms – spray cans, larger buckets of liquid you paint on with a brush or roll on with a roller and even as tape.

Whether dealing with small punctures or larger troubled areas on your RV roof, Flex Seal has got you covered!

Appropriate Situations for Using Flex Seal on RV Roofs

A motorhome with a Flex Seal-coated roof parked in a scenic campsite.

You might want to grab Flex Seal for quick fixes on your RV roof. It’s great for stopping leaks fast. Let’s say you spot a small crack or hole while inspecting the roof. Spray some Flex Seal and it will seal it up tight, keeping water out.

Even if you find damaged seals around vents or air conditioners, Flex Seal can come to the rescue.

Now, if your whole roof needs attention, that’s where Flex Seal really shines. You can use its liquid form to coat the entire surface. This creates a waterproof barrier that lasts long into your road trip adventures.

Remember, small patches work well with spray versions but go with liquid when more coverage is needed.

How to Apply Flex Seal for RV Roof Repairs

Understanding the nuances of applying Flex Seal can be crucial in ensuring a water-tight barrier over your RV’s sanctuary—let’s explore this process to guarantee you’re ready for any leaks nature throws your way.

Preparing the Roof

Getting your RV roof ready for Flex Seal starts with a thorough cleaning. It’s essential to do this right, so the sealant sticks well.

  • Check the entire roof for any damage like cracks or tears. Use a ladder and walk carefully on the roof.
  • Clear all debris, dirt, and leaves. Use a broom or blower for loose stuff and then rinse with water.
  • Scrub the surface with a brush and a mild cleaner. Avoid harsh chemicals that might damage the material.
  • Rinse the roof completely, making sure there’s no soap left. Wait until it’s totally dry before applying Flex Seal.
  • Inspect every inch again once dry. Look for areas that may need special attention and mark them if necessary.
  • Remove old caulking or sealant using a putty knife or scraper. Be gentle to avoid harming your RV’s roof.
  • Tape off any areas around vents, antennas, or edges you don’t want coated. This keeps your job neat.
  • Apply rubbing alcohol to spots with stubborn residue for clean-up. Wipe these areas clean before coating.
  • Ensure your weather conditions are suitable: dry and not too cold or hot for the best application of Flex Seal.

Applying Flex Seal

Flex Seal keeps RV roofs safe from leaks. It’s a strong, water-resistant barrier that’s easy to use.

  • Clean the roof area where you’ll apply Flex Seal. Make sure it’s free of dirt, rust, and debris for the best adhesion.
  • Dry the cleaned surface completely. Water or moisture can stop Flex Seal from sticking properly.
  • Shake your can of Flex Seal vigorously for about a minute before using it.
  • Hold the can 8 to 12 inches away from the surface. Start spraying in a sweeping motion to cover the area evenly.
  • Apply several light coats instead of one thick coat. This builds up a stronger seal.
  • Wait for each coat to dry before applying the next one. Drying times can vary based on temperature and humidity.
  • Use masking tape around areas you don’t want coated. After finishing with Flex Seal, remove the tape quickly for crisp edges.
  • Inspect the entire coverage to ensure there are no gaps or thin spots. Add more coats if necessary.
  • Pour Flex Seal Liquid directly onto larger leaks and spread with a brush or roller.
  • Allow each layer of Flex Seal Liquid to dry for 24 hours before adding another layer, ensuring an air-tight seal.
  • For emergencies, grab some Flex Tape. Simply peel off the backing and stick it onto the leak for an instant temporary fix.
  • Check your work once everything is completely dry to make sure your roof is fully sealed and protected.

Types of Flex Seal Suitable for RV Roofs

Flex Seal Liquid is a liquid rubber sealant that can cover large RV roof areas. It creates a durable, waterproof barrier. For quick fixes or small leaks, Flex Tape works well. This tape seals out water and sticks to almost any surface on your camper’s roof.

You might also consider Flex Shot for hard-to-reach spots around vents or air conditioning units. It comes in a caulking tube which makes precise application easy. Remember to choose the right Flex Seal product based on the repair you need for a tight, long-lasting fix.

The Pros and Cons of Using Flex Seal on RV Roofs

When considering Flex Seal for RV roof repairs, it’s crucial to weigh the benefits against potential drawbacks. This resilient sealant might be a game-changer in combating leaks, but understanding its full spectrum of performance—both where it shines and where it may fall short—is essential for any informed RV owner.

Advantage of Flex Seal

Flex Seal jumps into action for quick RV roof fixes. Picture this: you’re in the middle of a camping trip when your RV roof starts leaking. With Flex Seal, you can patch up those leaks fast.

This means more time enjoying nature and less time worrying about your camper’s roof. It sticks to almost anything, creating an air tight barrier that water and air cannot pass through.

RV owners love Flex Seal products because they are so easy to use. There’s no mixing or heavy lifting involved. You just spray on the liquid, tape up a seam with Flex Tape, or apply Flex Shot for precise areas needing waterproofing attention.

Even better – the customer service team is always ready to help guide you if needed! Whether it’s flashing pipes or sealing around vents, Flex Seal has got you covered so that your motor home stays cozy and dry inside.

Disadvantages of Flex Seal

Flex Seal might not be the best friend for your RV’s roof. Without UV stabilization, it can weaken when exposed to the sun’s harsh rays. Imagine heading out on a road trip and finding that your sealant has given up due to the sunlight! That could lead to leaks and damage inside your camper.

Also, this product lacks flexibility. As you drive along winding roads, your RV bends and flexes slightly. A rigid sealant like Flex Seal might crack or peel off under these conditions.

Now think about its holding power; it’s simply not strong enough for some materials common in RV construction. Reports have come in from users who’ve seen it fail—especially where there’s lots of movement or temperature changes involved.

Your mobile home twists and turns as you travel, so you need something glued down tight! Fixing an RV roof is no small job, so choosing the right lap sealant is crucial if you want a worry-free adventure on the open road.

Concerns About Using Flex Seal on RV Roofs

While Flex Seal might seem like a quick fix for RV roof repairs, there are some notable concerns to consider before applying this sealant. The reliability of Flex Seal is put to the test under various conditions related to UV exposure, temperature fluctuations, and the dynamic movements an RV endures on the road—factors that could ultimately affect its performance and longevity as a dependable solution.

UV Stabilization

UV rays can seriously harm an RV roof. They make materials break down and crack over time. Flex Seal, though handy, doesn’t stop this damage because it isn’t UV-stabilized. Your RV’s roof faces the sun every day, so it needs strong protection to last longer.

Many RV maintenance pros suggest using products like Dicor Self-Leveling Lap Sealant or EternaBond tape instead because they are UV-resistant. These options protect your camper’s roof from harsh sunlight better than Flex Seal can.

If you want your repairs to hold up in the long run, choose a sealant that fights off those powerful UV rays.

Flexibility and Expansion/Contraction

RV roofs need materials that can handle movement. They expand and contract with temperature changes. Flex Seal might not be the best choice here. It has poor flexibility for these conditions.

Campers need sealants that stretch without breaking. Flex Seal’s lack of give could lead to cracks or gaps in your roof over time. This is why RV manufacturers suggest other products like ProFlex or Surebond SB-140, which are made to move with your RV.

Adhesion Challenges with RV Movement

Flex Seal might seem like a quick fix for an RV roof leak. But the reality is, your RV isn’t just sitting still. It moves and vibrates as you drive, which can loosen Flex Seal’s grip over time.

Think about it – every bump and turn on the road is a test for any repair material.

That’s why many RV owners find Flex Seal doesn’t hold up in the long run. The constant movement of their vehicle works against the sealant, leading to cracks and peeling. You need something strong enough to keep up with your travels, not give way after a few miles.

Don’t let those leaks trick you into thinking they’re fixed when they could be getting ready to make a comeback!

Alternatives to Flex Seal for RV Roofs

When it comes to fortifying your RV roof against the elements, Flex Seal has its merits, but it’s not the only player in the game. Venturing beyond one option opens a world of possibilities—each with unique attributes designed to keep your mobile abode in tip-top shape.

Let’s explore some noteworthy contenders that could be just the right fit for your RV’s needs.

Dicor Self-Leveling Lap Sealant

Dicor Self-Leveling Lap Sealant is a top choice for sealing up key areas on your RV roof. You can trust it to protect vent fans, pipe vents, screw heads, and roof edges. It sticks well to different materials like EPDM and TPO.

This sealant flows smoothly to create a solid barrier against leaks.

For those spots that need a thicker touch, there’s Dicor 551LSW-1 Non-Sag Roof Lap Sealant. It won’t drip or sag because it’s made to stay put even in vertical applications. With these options from Dicor, you can tackle any job on your RV roof with confidence.

EternaBond Tape

EternaBond tape is a strong fix for RV roofs. It uses synthetic polymers and has UV-resistant features. This means it stands up to the sun without breaking down. Once on your roof, EternaBond creates a tough bond that’s hard to break.

Its MicroSealant technology and UV-stable backing keep water out, even at -70 degrees Fahrenheit.

RV owners love EternaBond tape because it lasts long with little upkeep required. You just stick it on, press firmly, and let its built-in primer do the rest. No more worrying about your RV roof in any weather! With this tape, you are set for miles of adventure without leaks overhead.


ProFlex stands out as a top choice for sealing windows on RVs. Newmar trusts it to create a watertight seal that lasts. This sealant is unique because it’s not made with silicone. That means no annoying residue left behind, and any future repairs will hold tight without issues.

Plus, at $17.06 on Amazon Prime, you can get your hands on ProFlex easily for your next RV maintenance project.

This sealant’s standout feature is its strong adherence despite the constant movement of an RV on the road. Unlike other products, ProFlex flexes with your rig, reducing the risk of cracks or leaks developing over time.

It accommodates expansion and contraction too—you won’t have to worry about gaps appearing as temperatures change with the seasons.

Surebond SB-140

Surebond SB-140 is a great choice for RV owners needing to reseal or replace their skylights. This sealant’s superpower comes from its butyl rubber base, giving it the strength to withstand temperatures up to 200°F.

It clings tightly to your RV roof, ensuring a snug fit that doesn’t mind the stretching and shrinking caused by temperature changes.

You won’t have trouble applying Surebond SB-140 since it’s designed with RV roofs in mind. Its stickiness helps it stay put as you move around on your adventures. Trust this tough sealant to keep water out and comfort in, no matter where you park your home-on-wheels.

Comparing Flex Seal with Other RV Roof Sealants

Given the variety of sealants available, it’s crucial to see how Flex Seal measures up against popular alternatives tailored for RV roofs. An analytical deep dive into their components and effectiveness can guide you towards the right choice—after all, your RV’s protection hinges on this decision.

Flex Seal vs Dicor Lap Sealant

Flex Seal and Dicor Lap Sealant serve the same purpose but work very differently. Flex Seal comes in a spray can or as tape, making it easy to use. It’s great for quick fixes, like sealing small leaks or covering cracks.

But when it comes to serious RV roof repairs, Dicor Lap Sealant is often the better choice. This sealant is popular among RV owners because it’s made for materials like EPDM and TPO roofs.

Now let’s talk about why some people prefer Dicor over Flex Seal for their RVs. Unlike Flex Seal, Dicor is UV stabilized – this means it won’t break down under the sun’s harsh rays.

Also, Dicor stays flexible after drying and moves with your RV which helps prevent future cracks and leaks. So while you might grab Flex Seal for an emergency fix on the road, consider using Dicor for long-lasting repairs that keep your roof safe from water damage.

Flex Seal vs EternaBond Tape

EternaBond tape outshines Flex Seal for fixing RV roofs. It’s known to be a stronger, more lasting fix. Why? Because RVs shake and move a lot on the road. This movement can make Flex Seal crack or peel off.

EternaBond tape sticks better to your roof through all that bouncing around.

With EternaBond, you also get a seal that stands up better to harsh sun rays and changing weather. Plus, it flexes with the roof when it gets hot or cold, reducing the chances of leaks returning.

Many RV owners see this as the go-to choice for dependable roof repairs over options like flex seal spray or flex seal tape.

Past Experiences: Success and Failure Stories Using Flex Seal on RV Roofs

Many RV owners have tried Flex Seal for quick fixes on their roofs. They talk about how easy it is to spray over a crack and see it seal up. Others share stories of coating their whole roof and watching the leaks stop.

These success tales often come from those who needed a fast, temporary solution or had small areas to cover.

But not all experiences are positive. Some folks applied Flex Seal only to find it peeling after a few months, especially in places with lots of sun or extreme weather changes. A few mentioned that their RV’s movement caused the sealant to crack, letting water in again.

Their advice? Use Flex Seal for short-term repairs but consider stronger options for anything big or long-lasting.


Fixing an RV roof is a big deal. You want it to last and keep water out. Flex Seal might seem easy, but remember, it’s not the best for sunlight or movement. For a job that sticks through trips and weather, try something made for RVs like Dicor or Eternabond Tape.

Safe travels and dry days ahead!


1. Can Flex Seal be used on an RV roof?

Absolutely! Flex Seal is a versatile product that works wonders on RV roofs. It creates a strong, waterproof seal that can handle the elements, protecting your mobile haven from leaks.

2. Is it hard to apply Flex Seal to my RV roof?

Not at all – applying Flex Seal is quite straightforward. Just make sure your roof is clean and dry before you start, then spray or roll the product on. You’ll find tutorials on their YouTube channel if you need some visual guidance.

3. Will Flex Seal work over any type of material?

Flex Seal is pretty impressive; it sticks to just about anything, including laminate surfaces common in many RVs! For more specific materials like vulcanized rubber, check the label or their online resources for compatibility info.

4. How long does this stuff last once it’s up there?

Longevity is key with this kind of fix — and guess what? When applied correctly, Flex Seal forms a durable bond meant to keep your travels trouble-free for years.

Affiliate Disclosure: As an Amazon Associate I earn from qualifying purchases.

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