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It kind of is too easy to be true... I did a test run on an old headset spacer which had quite an intense dark finish and it came off like a dream.
Very generous of you to offer your polishing machine - thank you! I just started sanding a bit by hand to see what happens, and I think I should be okay. I'll let you know if I start dreaming of a machine to do it for me!
Also, I have no car : (
Looks too easy to be true... Not sure if it would have worked on the thick black powered coating of my Sram crankset, which I patiently removed with a few dremel rotary wire brushes and two sanding stages (180 and 400)...