I've removed light scratchs with 3m super duty compound using a foam pad on a buffer, then use 3m FinisseIt to get the shine back. Gel is much thicker than paint and doesn't burn like clear coat on a car, I find it much easier to work with. If the scratch is too deep you can rub all the color off and see the fiberglass. Then the only option is to spray gel coat.
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