Bayhydrol F 245 Polyester polyurethane resin Bayer MaterialScience Polyurethane (PU) - Polyurethane dispersions (PUDs) >> Polyester Coatings >> Waterborne Polyester polyurethane dispersion which dries by oxidation. As a binder in the formulation of aqueous air- and force-drying high gloss coatings and primers with very good anti-corrosion resistance. Polyester polyurethane dispersion. Used in high gloss coatings and primers. Offers very good anti-corrosion resistance.