Its helpful to use a straight-edge as a guide while scuffing back and forth with the piece of Scotchbrite. Something softer than the alloy, such as a scrap piece of wood; a half-round, a 1"x1", even a scrap piece of baseboard. The results are more uniform as in this trunk.
Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
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I coated my panels with Sharkhide when I assembled my car but at this time I would not recommend that you try any type of protective coating. Sharkhide is difficult and tricky to apply and doing so in a finished car would be nearly impossible. I would concentrate on finding a method of polishing the panels out as suggested above and that you are happy with the results of - and stick with that.
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