Blue Max® Waterproofing and Crack Prevention Tile and Floor Membrane is a tough, blue, elastomeric, liquid rubber for the application of floor and wall tiles and stone work. Can be used in both commercial and residential applications and is easy to apply. Use in conjunction with Ames Poly-Bridge Fabric and Ames Blue Max Caulk for the ultimate air-tight waterproof membrane. All Ames coatings are low VOC, water clean-up, and made in the USA.