Damtite Waterproofing 11451 Max-Cover Powder Waterproofer, White 45#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. Highlights: Size kg: 20. 4 Powder Concrete Masonry Interior Exterior