Rust-Oleum Leak Seal vs Flex Seal: 2 Options, 1 is Best

In the market of must-have RVing supplies, sealants are one you want to keep in your toolbox. All you need is a few of the right products and processes to keep you, your partner, and/ or your kids dry in the RV.

Here we break down Leak Seal vs Flex Seal, highlight some pros and cons, answer frequently asked questions, and reveal our final verdict.

Leak Seal vs Flex Seal

Leak Seal vs Flex Seal: Which is Best?

Leak Seal Pros & Cons:


  • Great for beginners at sealing up leaks.
  • Top choice for roof patching.
  • Performs great in all climates


  • If not applied in the perfect angle it can be ineffective.
  • Will erode and dissipate if it gets in contact with gasoline.

Of course, RVs are particularly vulnerable to leakage, even if you stayed in your backyard. With all those cracks, seams, and moving parts, it is almost impossible to avoid leakage.

Luckily, Rust-Oleum Leak Seal can be used on RV roofs. We even recommend using Rust-Oleum Leak Seal vs Flex Seal in this case, as it is more resistant to temperatures and other weather conditions.

Related: How to Keep Moisture Out of RV in Winter

Flex Seal Pros & Cons


  • Optimal on basically every surface


  • May need to apply multiple coats
  • Does not perform well in extreme weather conditions

How Much Flex Seal Do I Need?

This will depend on the surface you want to cover and the number of layers you need. But to give you a rough idea of this, here are some estimates. You can cover up to 8 ft with one Large 10-oz can, and with one Jumbo 14-oz. can, you should be able to cover up to 12 ft.

How Long Does Flex Seal Last?

Flex Seal can last 24 months on the shelf.

Related: How To Connect a Gas Grill to an RV?

Durability: Leak Seal vs Flex Seal

So overall, one crucial thing that differs between the two sealants in terms of durability is their ability to withstand temperatures.

Both products aren’t designed to work in extreme cold and heat, but Leak Seal seems to be more temperature-resistant than Flex Seal.

Related: What is a Poop Pyramid?

Flex and Leak Seal Commonalities

There are a few commonalities in the Flex Seal vs Leak Seal battle and we break them down in some faqs:

  • Can I use Leak Seal and Flex Seal on my RV Roof?
    • Yes, you can use both for your RV roof, but it’s best to use Leak Seal because it’s more durable and weather resistant.
  • Does Leak Seal or Flex Seal work for gas tanks?
    • No. Leak Seal and Flex Seal don’t work for gas tanks, as gasoline causes the material to deteriorate.
  • Can I use Leak Seal or Flex Seal for toilets?
    • Yes, both of these sealants are great for toilets, but just make sure the area is completely dry before you apply the sealant. Then let it dry for the recommended period, and you’re good to go.
  • Are Leak Seal and Flex Seal food safe?
    • No, Leak Seal and Flex Seal are not food safe, not even for pets. Do not use these sealants for anything that comes into contact with food.
  • How long does it take for Leak Seal and Flex Seal to dry?
    • The initial coat will dry in about 4 hours, but it takes about 24 to 48 hours to fully cure. Let it fully cure before exposing it to the elements for full effectiveness.

Related: How Does an RV Water System Work?

How To Apply Roof Sealing And Repair: Leak Seal vs Flex Seal

Related: Cassette Toilet vs Composting Toilet

Alternatives: What is the Best Thing to Seal an RV Roof?

  1. Proguard Liquid Roof RV Roof Sealant
  2. Flex Seal Liquid Rubber in a Can
  3. EternaBond RoofSeal Sealant Tape
  4. Dicor Rubber Roof Acrylic Coating
  5. Sashco Through The Roof Sealant

Related: Best Dehumidifier for Winter Storage of RV

The Verdict: What’s The Best Sealant For RV Owners?

After evaluating and experimenting with Leak Seal vs Flex Seal, we can say, go with your heart. Just kidding.

The winner of the Leak Seal vs Flex Seal battle is …. the Leak Seal

Or carry both products because you never know what’ll happen on the open road. Both of these sealants bring a wealth of advantages and solutions for RV owners.

Keep in mind, flex seal is not the best choice for exterior use because of its lack of weather resistance.

So, Flex Seal is the better choice for fixing any leaks on the inside of the RV. Leak Seal, on the other hand, will handle any leaks on the outside of the RV.

These are both great sealants, and which one you choose should depend on your specific situation and preferences.


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