Bayhydrol XP 2557 Polyurethane Bayer MaterialScience Polyurethane (PU) - Polyurethane dispersions (PUDs) Coatings >> Waterborne Wood & Furniture Coatings water Bayhydrol XP 2557 is a cosolvent free aliphatic, anionic, fatty acid-modified polyurethane dispersion. It is used as a binder in the formulation of water reducible coatings and sealers for wood and wood materials. Because of its outstanding mechanical and chemical resistance properties, especially its black heel mark resistance, Bayhydrol XP 2557 is ideally suited for the formulation of parquet sealers. Post-curing of such coatings with Bayhydur®, for example, brings additional advantages and results in waterborne two component coatings with significantly higher mechanical and chemical resistance. The mixing ratio of mill base to hardener is generally 10:1. Combination with other water-reducible binders is possible. As with any product, use of Bayhydrol XP 2557 in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability. Modified polyurethane dispersion. Used in water reducible coatings for wood and wood materials. Provides very good mechanical and chemical resistance properties, especially its black heel mark resistance.