Wet sand the surface of new molds to perfection before polishing. This significantly increases the quality and longevity of any mold, and all parts made in it! Using consecutively finer grades of sandpaper from 240-600, any orange peel, texture from PVA, or other imperfections in the mold surface can easily be removed. Also, use for sanding the plug before molding, and leveling of external gel coat repairs. Each combination package includes 240, 320, 400, 500, 600 grit.