Damtite 01451 Powder Waterproofer 45 lbs, WhiteHighlights : Safe for drinking water cisterns Seals, protects and beautifies vertical walls constructed of concrete, masonry, brick or stucco. Eliminates dampness and resists mildew, flaking or chalking while beautifying and sealing all pores and voids Helps reduce Radon Gas penetration through concrete block walls Just add water to powder and mix; brushes on like paint 7 lb. size covers up to 93 sq. ft. 21 lb. size covers up to 280 sq. ft. 45 lb.