Drylock 20915 Clear Masonry Waterproofer, 5 GallonUnlike ordinary paint that simply adheres to a surface and can be forced off by incoming water pressure, DRYLOK Clear Masonry Waterproofer actually penetrates the pores in that surface, bonding to the masonry and creating an impenetrable barrier. Waterproof interior, exterior, above or below grade walls. DRYLOK Clear Masonry Waterproofer is also perfect for floors, basements, retaining walls, decorative brick and stone facades, and more. Size: 5