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I have polished a few of these fans to the point where they were shiny enough to see yourself in, and they very quickly corroded to a degree. I think that they are made of some different alloy than the valve covers, the alternator, the power steering pump, and so on - those, I've had looking good for years, and the fan's polishing and reflectivity was different no matter what I did.
Maybe it's the exposure to water vapor from rain.
If I do this again, I'll look into clearcoating or powdercoating them with clear. I will say, that powdercoating might add a little weight, and I did worry about the extreme polishing that I did (which was risky, I worried about actually breaking one) upsetting the balance.
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