U-Pol 0741 Acid #8 1K Etch Primer, 450 ml Aerosol ID/SKU: UPO741 U-Pol U-Pol 0741 Acid #8 1K Etch Primer, 450 ml Aerosol. Grey acidic primer for the promotion of adhesion to metal surfaces. May be used for the repair of small rub-throughs to bare metal or the complete coating of new panels . BENEFITS Anti -corrosive and self etching. Quick, clean and efficient . Cromate -free . Great adhesion Bare Steel, Aluminum, Galvanized and Zinc coated Steels, fully cured paints, Polyester putties and fiberglass.