Flex Seal MAX Liquid Rubber Sealant Coating, 2.5 Gallon, Black
Flex Seal MAX Liquid Rubber Sealant Coating, 2.5 Gallon, Black
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Flex Seal MAX Liquid Rubber Sealant Coating, 2.5 Gallon, Black

Flex Seal MAX Liquid Rubber Sealant Coating, 2.5 Gallon, BlackFlex Seal MAX Liquid Rubber Sealant Coating 2 5 Gallon BlackFlex Seal MAX Liquid Rubber Sealant Coating 2 5 Gallon White
Actual ColorBlack

Key item features

  • Versatile Application: Flex Seal Liquid can be brushed, rolled, dipped, or poured on for various uses.
  • Watertight Seal: Provides a flexible, rubberized coating that seals out water, air, and moisture.
  • Rust Prevention: Prevents rust and corrosion, and is resistant to mildew and chemicals.
  • Maximum Coverage: Covers up to 20% more area than the original size, making it an economical choice.
  • Easy to Use: Goes on smooth and covers fast, ideal for quick repairs and sealing projects.
  • Multiple Uses: Suitable for fixing leaky roofs, gutters, RVs, skylights, pipes, windowsills, and more.
  • Durable Protection: When applied correctly, it can last for many years, providing long-term protection.
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About this item

Product details

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Customer ratings & reviews

4.5 out of 5 stars
stars
442 ratings288 reviews
How item rating is calculated
  1. 5 stars76% (338)
  2. 4 stars11% (48)
  3. 3 stars5% (22)
  4. 2 stars1% (5)
  5. 1 star7% (29)

Reviews summary

Pros

  • : Fills small cracks and crevices immediately.
  • : Can stretch to accommodate movement.
  • : Application process is straightforward with a brush or pouring.
  • : Forms a seal to stop leaks in various surfaces and applications.
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Showing 1-3 of 288 reviews

Apr 23, 2026
David
Item details
Color: White
Sold and shipped byThe Factory Depot
5 out of 5 stars review

Verified Purchase

Why i chose this, because it works. If you read or research the manufactures preparations prior to applying, you will find that "It Works". Really, the temperature range is between ( -80° ~ 350° ) , wow ! Only thing I did not care for was the smell at first. The off gas is bad. Always use your ppe respirator. In a few hours it dissipates and the smell is much weaker.

Helpful?2MK9GBITJ3H7821243511
Oct 12, 2023
mtrctyjake
5 out of 5 stars review

Seller Verified Purchase

Liquid Rubber is the BEST!

I used Flex Seal liquid rubber on a hairline crack on outer basement wall, application went on easy, used two coats...I feel very confident this will solve my problem. I researched many different products and I believe this is the Best product for my problem...Lord willing I'll have no more leaks!

Review from flexsealproducts.com
Helpful?2MK9GBITJ3H7821243511
reply from Flex Seal Family of Products Customer Care

Hi there! Thank you so much for your 5 star rating. If you'd like some helpful tips and tricks for future DIY's, feel free to message us at humans@flexsealproducts.com. Flex On!

Jun 17, 2021
D. Brown
5 out of 5 stars review

Seller Verified Purchase

Great product for RV roof's

I applied Flex Seal Liquid MAX to the roof of a 1999 RV. I was truly impressed at how well it covered the surface with very little prep. I trimmed the edges and roof features with a brush and used a roller to apply to the large flat areas. I highly recommend this product and plan to use it for more applications.

Review from flexsealproducts.com
Helpful?2MK9GBITJ3H7821243511
reply from Supplier Response

Hi there, thank you for this fantastic review! We're so glad the Flex Seal Liquid MAX worked perfectly for your RV roof project. We'd love to see photos of your Flex Success, so feel free to share any with us at Humans@FlexSealProducts.com. Until then, have a great day!