Designed specifically for fiberglass and gelcoat. Contains oxidation removers and lubricants that reduce heat and friction. Has a diminishing abrasive that gets finer as you polish, with penetrating wax to protect finish. Ultra-gloss with its diminishing abrasive allows you to complete all the steps necessary to bring badly oxidized or dull fiberglass up to a high gloss finish in just one step. Can be hand or machine applied.