Choose the proper wet-sanding paper based on the overall condition of the paint. If orange peel is heavy, use 1,000- or 1,200-grit paper. Use 1,500-grit paper for average orange peel. Always use water when color sanding. Apply light pressure and sand in one direction, not in circles. As you sand, you can feel the sandpaper glide over the smooth areas; the paper will provide resistance over the non-sanded areas.