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"sandpaper" and "polish" just don't belong in the same paragraph !!!

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I have polished aluminum to a Chrome like finish. Especially if it's still as cast and not had any work done you'll realize that you need to sand it. As previously stated carefully/properly stepping the grit of the paper in stages will allow you to polish any metal.

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Some cast pieces are sanded for sure before polishing. Think of polishing like very fine sanding, IMO.

I've polished quite a bit of aluminum over the years, I'm doing some Jensen parts right now...