These Mechanic's Time Savers Quick Fix welding kits are designed to produce a sound joint that is stronger than the parent metal being welded. There are no fluxes required and no flumes involved while using them. After applying the Mechanic's Time Savers Quick Fix welding kits, the welded metal can be sanded, drilled, polished, machine-tapped, treaded, plated, and even bent without causing pinholes or porosity. The kits include eight Quick Fix welding rods and one stainless steel bristle brush. Mechanic's Time Savers Quick Fix welding kits are composed of a special blend of components, including aluminum, copper, magnesium, zinc, and other proprietary alloys. You can use them to repair aluminum, zinc, die-cast aluminum, pot metal, white metal, and galvanized steel. Simply introduce a heat source such as map gas, propane, butane, or oxyacetylene, and Mechanic's Time Savers Quick Fix welding kits can repair most non-magnetic, non-ferrous metals.