To improve solder flow, simply add a drop of flux. This particular flux is suitable for use on various metals, including copper, brass, bronze, steel, stainless steel, nickel, and galvanized metals. It’s ideal for soldering hinges onto stainless steel bracelets and is best used alongside our rosin core solder wire. The flux comes in a 1/2 oz bottle, and it’s important to use proper ventilation and protective clothing when soldering.