EPU is a Two-component Exposed Polyurethane resin made out of the main material of aliphatic isocyanate prepolymer. This product provides superior chemical resistant to UV, salt, alkali and sulphate, and has passed 5,000 hours artificial weathering test. As a part of liquid applied roofing system EPU can be chosen as topcoat on aromatic polyurethane coating to provide weather resistance function.