EPIFANES PRIMER GRAY FOR POLYURETHANE The two component semi-gloss polyurethane primer provides a smooth non-porous surface followed by a final coat of high gloss poly-urethane paint. The poly-urethane primer dries quickly, has good hiding power, fills the surface, and sands very well. Used as a filling primer for outdoor and indoor use on gelcoat, existing poly-urethane, or epoxy paints Systems above the waterline. - GRAY