SMOOTH BONDO GLAZING AND SPOT PUTTY - 320 GRIT is great for smoothing and refining glaze and spot putty WET OR DRY SANDING - Use for wet sanding and dry sanding without switching sandpaper SMOOTH FINISH - Delivers 10% smoother finish vs. conventional 3M sandpaper LONGER LASTING SANDPAPER - Silicon carbide abrasive self-fractures for longer life GREAT FOR AUTO BODY REPAIR - �Silicon carbide grain is available in a range of grits from 400 grit for 2500 grit for non-aggressive sanding and polishing jobs on clear coat, plastic and metal, including areas that require hand compounding and for sanding dark colored paints