4CR 2100 Fiberglass Putty 500 g incl. hardener 6.2100.0501 In stock SKU 6.2100.0501 Be the first to review this product Quantity : Add to Cart Email Details Fill imperfections on a variety of large surfaces, including steel, aluminum, galvanized and fiberglass surfaces. Will even adhere to small rust areas. Easy sanding. Including hardener.