POLYUREA RAYSTON is a liquid applied roof waterproofing membrane based on a pure resin of pure polyurea, manufactured by the company KRYPTON CHEMICAL, S.L. Consists of a pure polyurea resins, bi-component, elastomeric without internal protection layer; which once polymerised conforms a jointless elastic lining, in form of a layer completely bonded to the support (concrete, mortar, ceramic, wood, metal and polyurethane foam (≥50 kg/m³)). Depending on support condition other type of primer may be advisable.