Weld Mold 42-C description: Weld Mold 42-C is a general-purpose low fuming coated brazing rod that produces excellent bonds on all types of metals. Welds over rust and dirt with relatively little fumes produced. 42-C is excellent for either thin flowing or bead forming applications. 42-C provides excellent bonds even when used for dissimilar metal combinations. It is Ideal for use on auto bodies and other sheet metal applications as well as for general-purpose usage on cast iron, steel, copper, galvanized, yellow brasses and bronze metals.