One Step - Restores and Protects. Restores color to faded fiberglass. Removes oxidation and chalking, water-line, water spots, tars and oils, and leaves a brilliant protective coating that lasts for months. There is no need to wax over IOSSO because it does not contain silicone, it will not cause problems with refinishing at a later time. One 10 ounce can is approximately enough to clean an 18 foot boat above the waterline.