Y-10 Fiberglass Stain Remover is a unique stain absorbing gel that serves a variety of purposes. It is ideal for removing oil, rust, exhaust, waterline and transom stains. Also for shower stalls and furniture made of fiberglass. Its non-abrasive quality means that it's safe to use on white painted surfaces as well as on gel-coat. Just be sure to test a small area first to be sure Y-10 will not damage the finish. This product requires no sanding or compounding, and can simply be applied with a brush, sponge or cloth. Wait a few minutes and then wipe or rinse off. Our favourite cleaning product due to the lack of elbow grease required.