Additol P 820 Cytec Surface Specialties Flow / Levelling agent Powder coating Additol™ P820 is a flow promoter masterbatch suitable for use in pigmented outdoor resistant powder coatings. The active substance is 10% in an outdoor resistant carboxylated polyester matrix. The addition of 6-7% (by weight) to a powder coating formulation is suggested. Flow promoter masterbatch. Used in pigmented outdoor resistant powder coatings.