Flex Seal is liquid rubber in a spray canister meant to fix leaks, cracks and small holes. Each can is filled with liquid rubber that, when sprayed, coats a surface with dark black material in order to seal it. The black liquid rubber instantly fills into any small cracks and crevices and almost instantly prevents water and other liquids from seeping out.

Each large canister can be used to cover an area of up to eight square feet or more depending on how thick of a coating is applied. It’s also very easy to use, as you simply hold the canister approximately 14 inches away from the surface you wish to seal. For best results, the spray canister should be kept at above 60 degrees Fahrenheit and may be used to coat an area several times as needed. The canister states that for best results, it should also be applied to an area slightly larger than the crack or hole itself.

While the idea behind Flex Seal seems fairly simple, it’s actually fairly amazing in practice. It’s hard to find any competing product that is as versatile at sealing leaks as this one. For starters, it can be used on both wet and dry surfaces. This is extremely important if the leak is constant and in danger of causing immediate damage. It’s also effective on nearly any type of material. Wood, metal, rubber and ceramics are all compatible with the product. Since it’s completely waterproof, it can stop leaks of all kinds in no time.

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