Formula is specifically designed to both clean the gel coat surfaces and leave behind a high gloss finish in one Removes heavy oxidation, scratches, stains, and tough water spots on all fiberglass gel coat surfaces Restores neglected surfaces, producing amazing shine and luster Restores the color leaving behind a rich gloss Formulated to be effective by Hand or by Machine Meguiar's Marine One-Step Compound is an advanced aggressive but safe cutting compound with polish that cleans and restores gloss to gel coat surfaces in one step. It removes moderate to heavy oxidation, scratches, stains, and tough water spots on all fiberglass and painted gel coat marine or RV surfaces. Apply by hand or machine to get incredible results.