One Step - Restores color to faded fiberglass in one step. 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 oz can will clean an 18 foot boat from the waterline up.