Sanding sponges are coated with a high-performance abrasives and a waterproof bond so they can be used wet or dry. They are designed to give needed flexibility for hand sanding without leaving finger marks. Their conformability allows you to generate a superior finish in hard-to-reach areas and they can be used instead of scuff pads or waterproof sheets.
They can be used on a variety of materials – metal, glass, composites, and plastics as well as on primer or painted surfaces.