Two-component, anti-corrosive, multi-use epoxy primer from Awlgrip is used to seal filler primers and fairing work before applying topcoats. Awlgrip's 545 epoxy primer is for use above and below the waterline. For steel, aluminum, wood, and fiberglass substrates. Mix ratio of 1: 1. Above and below waterline applications For steel, aluminum, and fiberglass substrates | 545 Epoxy Primer, Gallon in Grey