The Kaleidoscope Zinc Chromate Primer – 1 Quart Gray is a specialized metal primer designed for industrial and maintenance applications. Ideal for machinery, metal surfaces, iron, steel, aluminum, and galvanized surfaces. Use one coat of etching primer followed by this zinc chromate primer, finish with one or two coats of industrial enamel. Hard-drying, high-gloss enamel that dries within 3 hours.