Meguiar's M4516 Marine/RV Polish & Gloss Enhancer - 16 oz. RV/MARINE POLISH: Contains rich polishing oils to feed and nourish gel coat and fiberglass marine and RV surfaces OPTIMAL GLOSS: Produces optimal gloss on gel coat and fiberglass surfaces by restoring valuable oils POLISHING STEP: An excellent polishing treatment to apply after cleaning and before waxing or sealing AMAZING ON DARK COLORS: Can be used on all fiberglass and painted marine or RV surfaces, and is especially effective on dark colors VERSATILE USE: Formulated to be effective by hand or machine