Olympic 216 G 1-Gal Gunzite Epoxy Primer is a two-part epoxy primer for application over fiberglass or unusually rough plaster or concrete. The heavy viscosity of GUNZITE acts as a fill coat on concrete and plaster and provides a much smoother surface, GUNZITE should only be used as an undercoat for POXOLON 2 or ZERON. Especially effective on sandblasted surfaces.