Flex Seal Liquid Review: Does it Stop Leaks?


Flex Seal Liquid

Flex Seal Liquid is a liquid rubber adhesive created to stop leaks from potentially damaged areas. Read our Flex Seal Liquid review plus additional product information.

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Claims & Features

  • Brush, roll, dip, or pour it
  • Seals out water, air, and moisture
  • Prevents corrosion and rust
  • Covers quickly
  • 16 ounce can
  • UV, mildew, and chemical resistant
  • Non-hazardous and food safe
  • Stops noise and vibrations
  • Available in white, clear, black, and gray

Cost & Availability

Online: $19.99 + $9.95 S&H + a separate $9.99 processing; can’t opt out of bonus can and Flex Shot canister.

It is currently only available from the official product website, flexsealliquid.com, which was first registered in September 2015.

Flex Seal Liquid Commercial

The TV commercial below has been airing as of this writing.


Hi, Phil Swift here for Flex Seal, the easy way to coat, seal, and stop leaks fast. And now there’s Flex Seal Liquid, the super thick rubber that you can pour right into cracks, to stop water dead in its tracks. You could brush or roll large areas for water tight seal. Even dip all your tools for a tough no-slip grip.

Flex Seal starts out as a thick liquid and turns into a super strong flexible rubber. Dip PVC pipes or downspouts to create a watertight seal that lasts for years. This rubberized coating prevents rust and corrosion. In extreme heat or cold, Flex Seal Liqud keeps its hold.

Unlike thin paints, Flex Seal Liquid is super thick and creates a flexible barrier that’s completely waterproof.

It’s like a handyman in a can.

Flex Seal Liquid is safe around plants and animals, so we used it to seal this fish pond. Now any project big or small, with Flex Seal you can do ’em all.

To show you the incredible sealing power of Flex Seal Liquid, we made this entire air boat out of screen and covered it in Flex Seal Liquid.

After a day on the water, flying through alligator-infested swamps, Flex Seal’s water-tight barrier takes a beating, stays strong and flexible, and the inside is completely dry. Yahoo!

Brush, roll, dip, or pour. Imagine everything you can do with Flex Seal Liquid. You’ll get a large can of Flex Seal Liquid for just $19.99, plus we’ll include a handy can of Flex Seal and Flex Shot. That’s a large can of Flex Seal Liquid and a handy can of Flex Seal and Flex Shot, all for just $19.99. Order now.

Flex Seal Liquid Reviews

The past several years have seen a constant stream of Flex Seal-branded products advertised on television, all pitched by Phil Swift. The latest offering, which first appeared at the end of 2015, is Flex Seal Liquid. Unlike previous Flex Seal products – which were available in spray cans – Flex Seal Liquid comes in a can and is utilized in the same manner as paint.

The product can be applied in a variety of ways: rolling, dipping, pouring, etc. The commercial does accurately show effective uses for Flex Seal Liquid. PVC pipe dipped in the can, for example, will harden to form a perfect waterproof bond.

It takes about an hour for the product to dry.

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As far as working as advertised, we will give Flex Seal Liquid high marks. It seals to form a nice rubber coating, and only a thin layer is often sufficient to waterproof or stop leaks. The advertising continues the Flex Seal tradition of showing Phil Swift in a vehicle made watertight by Flex Seal Liquid. It has proven to be an effective visual in past advertising spots.

Although Mr. Swift stands next to a massive 6-foot tall display of Flex Seal Liquid, the “large” can is not very large when viewed in person. It is in fact only a 16 ounce can, which is suitable for small jobs around the house, but certainly not enough to cover an entire rooftop as shown in the advertising.

The pricing of Flex Seal Liquid uses a new, and somewhat shady, technique in which the processing and handling are priced separately. Standard television marketing combines processing and handling (P&H) into a single cost, but here we have a processing cost of $9.99 and a separate shipping cost of $9.95. Thus, your total cost for a 16 ounce can plus the two obligatory extras is about $40.

Similar Products

Liquid rubber products such as Flex Seal Liquid have existed for years. A popular product on Amazon by Rust-Oleum is called LeakSeal. It looks and performs virtually the same as Flex Seal Liquid. As of this writing it holds a 4.1 star rating at Amazon and is priced at around $30. That can holds 30 ounces, versus only 16 ounces for Flex Seal Liquid.

Epic Conclusion

Flex Seal Liquid gets the job done, but the exorbitant processing and shipping fees and the small size in the can will lead many customers to look elsewhere. When it becomes available in stores, it will likely be more competitively priced.

If you’ve used Flex Seal Liquid, please give it a star rating and comment below.