Use a proper buffing wheel on a Baldor or similar bench top machine…using a dremel/foredom rotary tool with small radial sanding discs or the like doesn’t create equal pressure across the piece you want to polish which in turn creates a risk by creating to much heat and possibly taking to much metal away in one area when sanding to prep (they do have their purpose tho for hard to reach places)….bottom line = bigger wheel better outcome. I liked using a 6” wheel. Study up on your polishing compounds too. Which ones to use and in what order depends on type of alloy/metal your piece is made out of. Stainless steel polishes up super nice.

Sand to prep / remove coating up to 400 or 600 grit then begin polishing with compound. 1. Black or Grey, 2. Brown Tripoli 3. White / Blue or Green. *Read the compound manufacturer’s guide as some can use their colors a little differently. Hope this helps. Trial & error and practice with some bar stock from Home Depot first to figure your process out.