Chemical Coatings have also been a much older kind of waterproofing for metal and masonry surfaces. From simple coatings of asphalt, coal-tar pitch, bituminous and cement based waterproof coatings; today there are polyurethane (PU) elastomeric coatings, crystalline waterproof coatings and acrylic polymer-based cementitious coatings in different color and shades. Elastomeric coatings have a high crack bridging ability and can easily be applied by brush or a roller. These systems have medium flexibility and generally consist of a cementitious coating (generally an acrylic polymer) admixed with copolymers which add flexibility to the otherwise rigid material. This system can be applied in two coats or more and can be reinforced with high tensile fabrics.