Davis FSR Fiberglass Stain Remover Gel - 2 Liter Davis Fiberglass Stain Remover is a unique stain absorbing gel that is ideal for removing oil, rust, exhaust, waterline and transom stains. Its non-abrasive quality makes it safe to use on white painted surfaces as well as on gel-coat. Use FSR anywhere fiberglass stains may pop up including shower stalls and furniture. Can also be used to remove road soil from trailered boats and recreational vehicles. Davis Fiberglass Stain Remover is easy to use