Flex Paste Industrial Sealant, Thick Rubber Coating, Black, 8.75 fl oz
Flex Paste Industrial Sealant, Thick Rubber Coating, Black, 8.75 fl oz
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Flex Paste Industrial Sealant, Thick Rubber Coating, Black, 8.75 fl oz

Flex Paste Industrial Sealant, Thick Rubber Coating, Black, 8.75 fl ozFlex Paste Industrial Sealant Thick Rubber Paste 8 75 fl oz BlackFlex Paste Super Thick Rubber Paste 1 lb ClearFlex Paste Super Thick Rubber Paste 8 75 fl oz White
Actual Color:Black

Key item features

  • Versatile Applications: This industrial sealant is ideal for a wide range of repairs, including foundation, concrete, roof, RV, motorhome, auto, and boat projects, as well as sealing out rodents and pests, and general indoor and outdoor use.
  • Durable Coating: Starting as a thick paste, it dries into a strong, flexible rubber coating that resists shrinking and washing away, and can be painted to match any color.
  • Extreme Adhesion: The sealant can be applied effectively on both dry and wet surfaces, including underwater, ensuring reliable performance in various conditions.
  • Broad Material Compatibility: It adheres to numerous materials such as wood, glass, tile, concrete, aluminum, metal, brick, stucco, masonry, copper, fabric, fiberglass, ceramic, porcelain, natural stones, and various roofing and synthetic materials.
  • Product Specifications: Available in black, this 8.75 fl oz sealant measures 3 x 3.4 x 4.7 inches and weighs 1 pound, offered in both tubs and cartridges.
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Current price is $14.87
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Customer ratings & reviews

4.1 out of 5 stars
stars1,388 ratings842 reviews
How item rating is calculated
4.5
2.6
  1. 5 stars64% (887)
  2. 4 stars11% (159)
  3. 3 stars7% (99)
  4. 2 stars4% (58)
  5. 1 star13% (185)

Reviews summary

Pros

  • : Lasts a long time and withstands pressure.

Neutral

  • : Can be easy to use and resealable, but also prone to damage or drying out.
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Showing 1-3 of 842 reviews

May 10, 2020
RedDog
5 out of 5 stars review

Seller Verified Purchase

Flex Paste - Fixes Shower Tub/Leak

We've had an on-going problem with our 20 year old fiberglass/gelcoat shower/tub. The leak started as a small hairline crack in the bottom and has grown to 2-3". Over the last 3 years I've patched it twice with the Gelcoat Repair Kits which last a while, but begin leaking again. I did some research and decided to give Flex Paste a try. I covered the leaking area with Flex Paste and have been leak free for a couple of weeks. It seems like a solid repair and we'll see how long it lasts. I like that I can spread the Flex Paste well beyond the crack.

Review from flexsealproducts.com
Helpful?40Z3T6QHW6C0669440906
reply from Flex Seal Family of Products Customer Care

Flex Paste is incredibly durable and we're confident that your bathtub will be leak-free for many years. Please feel free to message us directly by email if you have any questions (Humans@FlexSealProducts.com). Thank you so much for sharing your experience with us. Flex On!

Nov 12, 2025
Guierrmo
Item details
Color: Black
Sold byMW, N & CoDelivered byWalmart
4 out of 5 stars review

Verified Purchase

Flex Paste Black review

I wish the cure time was faster. used to repair large hole in plastic fender liner on older Honda Civic. Ended up putting 2 layers on over period of 2 days.

Helpful?40Z3T6QHW6C0669440906
Nov 7, 2022
Walmart customer
4 out of 5 stars review

Seller Verified Purchase

Flex seal has a new purpose (or two)

Two different uses of the Flexseal paste I have never seen advertised. 1) I have used Flexseal to repair bicycle inner tube punctures rather than a cheap patch. Normal prep of the tube and a coating if the paste is all that's required tor an air tight seal and no issues. As a competitive cyclist, I have lots of training rides in less than ideal conditions resulting in several punctures. I'll usually collect several tubes and spend very few minutes affecting the repairs. 2) I'm currently replacing pool decking and installing composite decking over a concrete and paver pool deck. Over time, the pool deck has shifted and cracked and the surface is uneven and broken in places. I use Flex seal to help anchor the ends of the composite decking to the existing surface to keep the surface level and secure. Works well.

Review from flexsealproducts.com
Helpful?40Z3T6QHW6C0669440906
reply from Flex Seal Family of Products Customer Care

Hi there, thank you so much for sharing your Flex Success with us! We're happy to hear the Flex Seal Family of Products is working great for your projects and repairs. If you'd like some helpful tips and tricks for future DIY's, feel free to message us at Humans@FlexSealProducts.com. Flex On!