2x U-POL WELDC/AL #2 Weld Through Primer COPPER Rich Aerosol - 450MLModel No. WELDC/ALWELD#2 Weld Through PrimerPREMIUM AEROSOLSA high adhesion, super conductive primer offering excellent rust protection when applied to suitably prepared panels prior to SPOT, MIG and TIG welding.Fast drying – speeds up the welding processHigh concentration of zinc or copper in the dry filmCorrosion resistant