Additol P 810 Polyester resin. Cytec Surface Specialties North America South and Central America Flow / Levelling agent Coatings Additol™ P 810 is a flow agent masterbatch developed for clear coatings. The active substance is 5 % on a hydroxylated superdurable polyester resin. Coatings based on Additol™ P 810 and Crylcoat™ 4890-0 with a ccaprolactam-blocked isocyanate or urethdione type hardener produce clearcoats with excellent flow and outdoor resistance. Hydroxylated superdurable polyester resin. Exhibits excellent flow and outdoor resistance. Used to produce clear coatings.