Flex Paste™ is a thick rubberized paste that clings to surfaces and instantly fills gaps, cracks and holes. It can be applied on wet or dry surfaces - even underwater! It creates a flexible, water-tight rubberized coating that never shrinks or cracks and seals out air, water and moisture. Can be shaped, molded and painted any color. Great for DIY home projects, it can also be used to seal holes to keep rodents and insects out of your home. Non-flammable formula is chemical and mildew resistant. 1 lb. Jar. Choose: White or Black.