West System 502 black pigment colour additive 125g is an epoxy-based liquid colorant used to tint the epoxy mixture black, providing an even, black color base for the final finish system. Colored surfaces also tend to highlight flaws and imperfections. Cured, pigmented epoxy surfaces are not final finish surfaces but require an additional paint or UV filter coating for ultraviolet protection. You can blend it into any West System 105 Epoxy Resin/200 Series Hardener combination, G/flex 650, or G/5 Five-Minute Adhesive.