Mirka Gold Velcro backed discs are a durable product very well suited for sanding at high speeds. Gold is an all-round sanding material that can be used for many purposes. In order to achieve an optimal sanding result, the semi-open grit binding and special stearate coatings are designed to prevent clogging and pill forming. Coarser grits are recommended for the sanding of putty and removing lacquer while the finer grits are excellent for dry sanding primed or lacquered surfaces in preparation for following coats.