Meguiar's Marine One-Step Compound - 1 Gallon *Case of 4*Meguiar's Marine One Step Compound is a powerful, user friendly gel coat restoration solution designed for boats and RVs. It cleans and polishes in a single pass, delivering showroom worthy gloss with minimal effort. One step cleaning and polishing: cleans and polishes in a single pass, saving time on every project. Oxidation and defect removal: removes moderate to heavy oxidation, scratches, stains, and tough water spots on all fiberglass gel coat