All colors and the clear may be flattened by adding U-3218. This is a very heavy bodied material and must be thoroughly mixed, preferably by use of a drill motor mixer, before adding to the color base. It must be briskly mixed into color base before catalyst is added. Do not add flattening to catalyzed color. For satin, semigloss finish, add one-half volume U-3218 to one volume color base and mix thoroughly with drill motor mixer. For flat finish, mix equal volumes U-3218 and color base and mix well with drill motor mixer. Add appropriate quantity of brush or spray catalyst (one part color base to one part U-1001C catalyst for spray; two parts color base to one part U-2964 catalyst for brushing). The ratio of color base to catalyst is always the same regardless of the addition of the flattening agent.