Special product for polishing glass with high-quality cork / synthetic resin coating – Long service life with consistent polishing effect – Waterproof Cork sanding belts for edge polishing finish for high-gloss edges. For best results, we recommend pre-grinding with silicon carbide abrasive belts grit size 400, 800 or 1000. The finer the Grit, the Glossier after the cork polishing. Before using, gently grind or peel cork band with thick glass to avoid edge splits.