Drylok 20913 Non-Pigmented Masonry Waterproofer, Clear, 1 GallonA clear waterproofer for Floors, Walls and Decorative surfaces. For horiz. surfaces, use alone on concrete or as a vapor barrier under adhesive and flooring. On vertical surfaces, resists driving rain and 98 mph wind on exterior surfaces and hydrostatic pressure on interior walls. Size: 1 gallon Color: Clear Interior Exterior use Stops hydrostatic pressure High abrasion resistance Specifically formulated for use on bare masonry floor & wall surfaces