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Size:16 fl. oz. Metal Etch – Etches Bare Metal & Inhibits Rust. 3X:Chemistry Metal Etch inhibits rust and promotes paint adhesion for bare metal surfaces. This specially formulated liquid gently etches the metal, then leaves a zinc coating that helps chemically bind paint to the surface. Metal Etch is non-toxic, non-flammable and reusable. Ideal for application on bare metal parts after sandblasting or using 3X Rust Dissolver. Zinc Phosphate coating inhibits rust on bare metal surfaces. Etches bare metal to chemically bind paint to the surface. Reusable liquid can be sprayed, brushed, or dipped.