Wet sanding a twenty by hand is very doable. Factory gel coat, measured in mil’s, is normally about a dime thick. Probably thicker on older models. Unless you want a different color, you’ll be amazed at how the oxidation can be removed up to 100%. That yellow is classic and after years of detail experience always remember one thing:
Cars are painted.
Boats are gel coated.
Just go bump your dock, or ask me how I know.
Vezo.
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