Thick rubberized liquid

Paquete Flexin' para Cimientos

Brush, roll, dip or pour. From quick fixes to creative projects, Flex Seal® Liquid is the go-to solution for sealing, coating, and protecting virtually anything.

Play for sound

FLEX SEAL LIQUID IN ACTION

Thick, flexible, self-leveling

Flex Seal® Liquid starts out thick enough to seep into cracks and holes, then settles into a smooth, even coat.

FLEX SEAL LIQUID IN ACTION

Water Can't Push Through

Flex Seal® Liquid creates a thick, watertight barrier that locks out moisture and protects against water damage. Ideal for sealing basement walls, floors, and trouble spots.

Water · Weather · Mildew · Chemicals · UV

Dries to a rubber shield

FLEX SEAL LIQUID IN ACTION

Flexes instead of CRACKING

Flex Seal® Liquid expands and contracts with the surface through every season, so the seal stays flexible instead of cracking. The cured seal withstands −80°F to 350°F.

ABOUT FLEX SEAL LIQUID

Flex Seal Liquid seeps into cracks and holes to seal out air, water, and moisture. It dries to a watertight, flexible rubberized coating that’s waterproof and weatherproof, as well as mildew, chemical, and UV resistant.

Use it for:

Concrete and asphalt repair
Foundation repair
Preventing rust and corrosion
Stopping basement seepage
Weatherizing and sealing out moisture
Home and roof repair
RV and motorhome weatherizing and repair
Pools and pool equipment
Outdoor fountains, bird baths, and more

WARNING: California Proposition 65 Notice.

Common questions

How do I apply it?

Wear protective clothing. Make sure the surface is clean, dry, and free of grease, oil, and dirt.
Increase adhesion by etching the surface with sandpaper.
Brush, roll, dip, or pour Flex Seal Liquid directly onto the surface.
Allow each coat to dry completely — 24 to 48 hours — before adding another. It fully cures in 48 hours.

How much will one can of it cover?

Coverage will vary depending on the number of coats used and what type of surface you are applying Flex Seal Liquid onto. However, our available sizes typically cover the following area: 1 Large 16oz – up to 18.75 sq. ft., 1 Jumbo 32oz – up to 37.5 sq. ft., 1 Giant Gallon – up to 150 sq. ft.

What temperatures will it withstand?

Flex Seal Liquid has a wide temperature range from -80 to 350 degrees Fahrenheit. For best results, we recommend applying it to surfaces and substrates in temperatures between 32 and 120 degrees Fahrenheit.

Can I apply it on a wet surface or when it's raining?

It's always best to apply Flex Seal Liquid on a clean, dry surface free of grease and oil. If applied during heavy rain, some of the product may wash away. Therefore, we recommend applying it 24 hours prior to any heavy rain, hail or snowfall (if possible).

Will it expand and contract in the summer and winter?

Yes, Flex Seal Liquid stretches, stays flexible, expands and contracts.

What is the shelf life of FLEX SEAL LIQUID?

Flex Seal Liquid has a shelf life of 24 months when properly stored. If the can remains open for an extended period of time a skin may form on the surface. In order to avoid skinning over, remove the lid, use immediately and always replace the lid after each use. If skinning does occur, remove the top layer and use product.

Is it safe to use around plants and animals?

Yes, Flex Seal Liquid is safe around plants and animals (once fully cured).

Can I use it on the inside of my rainwater barrel?

Yes, Flex Seal Liquid is safe on rain barrels (once fully cured).

How much pressure will it withstand?

The maximum pressure Flex Seal Liquid can withstand will vary based on the surface and the conditions under which it is applied. It's always best to test a small area first.

Can I dilute it?

Flex Seal Liquid is ready to use and should be used right out of the can. Do not dilute it with solvents or water.

How do I clean it up?

You can clean up excess or spilled product with a dry cloth or paper towel and mineral spirits (BEFORE the liquid begins to cure). DO NOT USE water or alcohol-based solvents.

Can I use it to repair a gasoline tank?

We do not recommend using Flex Seal Liquid to seal a gasoline tank or any other flammable liquids.

Can I paint it?

We do not recommend painting over Flex Seal Liquid.