STOP LEAKS FAST™
FLEX SEAL LIQUID® is available in pints, quarts, gallons and new MAX 2.5 gallon container.
Color options include black, white, clear and gray. MAX 2.5 gallon only available in black and white.
*Review count based on 5 star amazon.com reviews, collected between January 2016 and October 2021.
YES, now you can get MORE of the incredible coat, seal, and protect offered by Flex Seal Liquid in the new MAX Line sizes. Get 150% more Flex Seal Liquid when you buy Flex Seal Liquid MAX.
Flex Seal Liquid MAX is sold in 2.5 gallon containers.
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.
2.5 Gal MAX Size – up to 375 sq. ft.
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.
Yes, Flex Seal Liquid is safe around plants and animals (once fully cured).
Yes, Flex Seal Liquid stretches, stays flexible, expands and contracts.
Yes, Flex Seal Liquid is safe on rain barrels (once fully cured).
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.
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.
Flex Seal Liquid is ready to use and should be used right out of the can. Do not dilute it with solvents or water.
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.
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).
We do not recommend using Flex Seal Liquid to seal a gasoline tank or any other flammable liquids.
Once fully cured, Flex Seal Liquid can not be painted over with most traditional paints.
No, we do not recommend using Flex Seal Liquid on underfoot applications.