Tripoli Polishing Compound
Use for general cutting down, scratch removal, buffing, and coloring on non-ferrous metals such as zinc die castings, brass, copper, aluminum castings and sheets.
When using the buffs, attach to the tapered spindle. As it is spinning, hold the bar to the buff so that it puts a light coating on it (a few seconds). When changing bars, clean off the coating on the buff with a soft cloth as best as you can. These should be used dry.