Bayhydrol PR 650 Aliphatic polyurethane resin Bayer MaterialScience Polyurethane (PU) - Polyurethane dispersions (PUDs) Coatings >> Waterborne Plastic coating water Solvent-free, aliphatic polyurethane resin dispersion in water. Binder for waterborne, air-and oven-drying base coats in two-coat systems for the coatings of plastics and as a combination binder for soft-touch coatings. Bayhydrol PR 650 are characterized by good adhesion to many types of plastics, good overcoatability and good water resistance. Aliphatic polyurethane dispersion. Used in air-and oven-drying base coats in two-coat systems for the coatings of plastics. Possesses good overcoatability and good water resistance.