Aquatech's Buff and Cut Compound is a water soluble compound that's formulated to remove severe oxidation and scratches from gelcoat and paint. Use a brush or wax applicator to apply compound to surface to be buffed. Do no more than several sq. feet at a time. In direct sunlight you may use water in a mist type spray bottle to keep compound damp. This will increase buffing time, since @ is most effective when kept moist. Aquatech's Glass Cleaner will also work well as a "buffing spray".