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Yes, I use sand paper. Wet sanding starting with Windex on the 220 grit and finer. All by hand on these two projects here. I did use a DA on my latest KG-7 tank ring that was awful. The corrosion is like a cancer that goes deep sometimes. In this case, I used 180 grit on the DA until I was able to get to clear metal. You also have to be careful not to sand out details or casting trademarks etc. if you want to keep them. As for polishing compound, I have used Mothers, and just about anything that you can put on a wool pad. I mounted the wool pads on my drill press, and worked it that way. You have to also be very careful to not let the chuck contact your work, or you have to sand out the flaw all over again. I had pads for Dremel tools for the nooks and tight spots.
Steve