COOL-R BASE COAT 720S is a liquid applied roof waterproofing based on a pure polyurethane, consists of a polyurethane resin, bi-component, elastomeric, without internal protection layer; which once polymerised conforms an elastic lining, in form of a layer completely bonded to the support (concrete, mortar, ceramic, wood chipboard DMF, steel and other types of metal, polyurethane foam (PU)). Depending on support condition other type of primer may be advisable.