Pigment for our polyaspartic urethanes. Adding pigment to any urethane is always a great idea because the color stabilization of urethanes are superior. See below for how much you need per product.1/2 Pint:PC66 - Add 1/2 pint to a 2 gallon kit of PC66PC85 - Add 1/2 pint to a 1.5 gallon kit of PC85HP..