Dremel polishing compound is used to remove dull oxidized film and light imperfections on metals and plastics. This hard compound is applied with cloth or felt polishing accessories and nylon bristle brushes. Use with felt or cloth accessory bits to polish metals and plastics. Features and Benefits Highly effective and easy to use Brightens, polishes and removes light surface imperfections with ease Typical Applications Ideal for polishing or brightening For use on metals and plastics Can also remove light surface imperfections Applied with cloth or felt polishing accessories and nylon bristle brushes Notes When working with felt or cloth bits, keep the tool speed as low as possible. This allows the compound to gently deposit on the bit. Apply 421 polishing compound with a felt accessory and remove it with a cloth wheel accessory. Use with any of the following cleaning and polishing bits: #414, #422, #423 and #429. Or use with bristle brushe