Bayhydrol PR 435 is an aqueous aliphatic polyurethane dispersion that contains only 5% by weight of organic cosolvent. Properties / Applications: Bayhydrol PR 435 polyurethane dispersion has been developed especially for the formulation of water-borne air-dry or force-dry automotive refinish primer- surfaces. Automotive primer-surfaces based on Bayhydrol PR 435 display fast drying, good early sandability, abrasion resistance, durability and resistance to humidity. As with any product, use of Bayhydrol PR 435 in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability. Information provided by Covestro |