Shop for Paint at The Home Depot. 3M Sanding Sponge CP041-3PK, Single Angle, 4.875 in x 2.875 in x 1 in, Medium grit, 3/Pack. Angled for corner/detail work. Rinse and reuse. Use wet or dry. 3M Sanding Sponges are designed for wet or dry sanding on wood, paint, metal, plastic or drywall. Use this medium-grit sponge for moderate stripping or surface leveling in preparation for a coating. This sponge features conventional 3M abrasives and is made with durable, flexible foam. Sanding is an integral step in preparing a surface to receive a coating. For the best sanding results, sand with the grain of the surface and work through a sequence of grits, from coarse to very fine, skipping no more than one grit between each sanding step. 3M sanding sponges are available in medium, fine and extra fine grits.