Additol P 966 Superdurable polyester resin matrix Cytec Surface Specialties North America South and Central America Catalyst / Accelerator Powder coating AdditolTM P 966 is a catalyst masterbatch for use in TGIC or PT-910 systems. AdditolTM P 966 contains 5% active ingredient in a superdurable polyester resin matrix. AdditolTM P 966 is easily handled and greatly improves dispersion of the catalyst in powder coating formulations. Catalyst masterbatch. Easily handled and greatly improves dispersion of the catalyst. Used in powder coating formulations.