UGL DRYLOK 20915 Masonry Waterproofer, Milky White, 5 gal Can

Waterproof interior, exterior, above or below grade walls. Unlike ordinary paint that simply adheres to a surface and can be forced off by incoming water pressure, DRYLOK floor and wall masonry waterproofer actually penetrates the pores in that surface, bonding to the masonry and creating an impenetrable barrier.