3. Color sanding begins with 1,000-grit wet or dry sandpaper. Wet or dry is available 1,000-3,000 grit. Wet sanding works best in water with car wash or dish soap added to act as a lubricant. For the next stage of polishing, old-school wool pads such as this Schlegel from Summit Racing work as good on today's finishes (urethane) as they did on paints used in the past (acrylic lacquer, catalyzed acrylic enamel).