Prime-Tek Epoxy Primer is a two-component, 1-to-1 ratio, thixotropic, water-based epoxy primer that is gray in color. This multi-purpose primer is easy to spread and enhances the bond of coatings over most metals, organic polymers, wood, masonry, asphalt, modified bitumen, and vitreous surfaces. It may also be used as a masonry block filler.