Additol P 865 Aromatic urethane Cytec Surface Specialties North America South and Central America Crosslinking / Coupling / Curing Agents Polyester Polyurethane Coatings >> Powder Coatings Additol™ P 965 is an aromatic urethane adduct crosslinking agent for use with hydroxyl terminated polyester resins in the manufacture of polyurethane powder coatings for indoor applications. Aromatic urethane adduct. Used with hydroxyl terminated polyester resins in the manufacture of polyurethane powder coatings for indoor applications.