C-Flux paste. This flux is the best that Ryan has found for use with soft solder. It works on steel, brass, German silver, copper, etc. 3 oz. jar. It is impossible to achieve a good solder joint without using a good flux. *See our item #SOLDER. Also, on our home page, to the right of the gun photos, is a list of helpful tips. Look under 'Soft Soldering Instructions' for Ryan's method.
