Johnson's J-33 Liquid Flux for Galvanized is an active chloride formulation, with the power to handle the toughest galvanized jobs. J-33 is used with Johnson's non-leaded Galvanized Repair Alloy and a torch for repairing galvanized surfaces, or with 50/50 low antimony solder and a soldering iron for sheet metal seams. J-33's residues are active and should be removed immediately after soldering for prevent dulling of coated metals.