The recommended primer for undercoating of the anti-rust gloss enamels. Use on unpainted ferrous metal, clean off rust before applying primer. Galvanized and aluminum metal surfaces should be primed with galvanized metal primer. Bare wood and interior walls should be primed with latex enamel primer. Exterior bare wood should be primed with an exterior oil primer. 12 oz. spray can covers approximately 18 to 25 sq. ft. Refer to model No. 465.0068227.076 for sandable primers.