Firestone Water Block

The Firestone Water Block Seal (S-20) is designed to be used with compression to give a water tight seal.

Firestone Lap Sealant is specifically designed edge treatment used to ensure a watertight seal while seaming two PondGard EPDM liners. This adhesive caulk serves as a final precaution against leaks and is applied to the outer edge of a seam. Firestone Lap Sealant applies easily using a caulk gun.  The water block sealant should only be used on clean surfaces and not have any loose material or other contaminants such as oil, grease, etc. Comes in 10 oz tubes. Made in the USA.