Our 3M Perfect-It Gelcoat Compound + Polish is a professional-grade formula, designed to be used as a single-step compound and polish or second step finish for eliminating P1000 and finer scratches, scuff marks, and other surface blemishes from gelcoat surfaces (even darker colored gelcoat) including marine, RV, and industrial. Use 3M Perfect-It Gelcoat Compound + Polish as a single-step compound and polish or second step finish for eliminating P1000 and finer scratches, scuff marks, and other surface blemishes from gelcoat surfaces (even darker colored gelcoat) including marine, RV, and industrial.