ISOPON ZINC 182 is a highly effective rust inhibiting primer. It can be applied to all ferrous metal surfaces provided the loose rust is removed. Complete removal of all rust will improve its effectiveness. The hardened ISOPON ZINC 182 forms a tough durable surface onto which paint can be applied. Once applied ISOPON ZINC 182 will provide first class rust protection to ferrous surfaces. ZINC182 Primer formulation can be directly topcoated with most solvent and water-based basecoats or solid colours. ZINC182 should be sanded with P400 grit paper before over painting.