Additol P 920 hydroxylated polyester matrix Cytec Surface Specialties North America South and Central America Catalyst / Accelerator Coatings Additol™ P 920 is a catalyst masterbatch designed to create wrinkle finishes. Additol™ P 920 contains 5% active substance in a hydroxylated polyester matrix. Coatings made using Additol™ P 920, Crylcoat™ 2920-0 and Powderlink 1174 produce a consistent wrinkle finish with good mechanical properties. Hydroxylated polyester matrix. Exhibits good mechanical properties. Used to create wrinkle finishes.