Re: Old boat paint
You might be able to get the blue gel coat on it shine again, but not always. Start with agressive buffing compound and an electric buffer (2500 RPM or less), try a spot and see how well it works. If the color doesn't come back with that method, then try some 600 grit sand paper and buff it again, this should work. You might need to go to a finer grit sand paper so you can buff out all the sanding marks.
Be careful on corners and edges, you don't want to sand or buff through the gel coat.
Most buffing compounds will work and each brand will have different grits from coarse to fine, coarse to cut through the oxidized surface and fine ones to get a high gloss.
Try a small area, it's not always possible to get back the original look, but it should look better than it does now.
Good luck.
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