Re: dremel polishing....
Most emery is black. I think emery is about 800 grit. I've never used it on aluminum, but I would guess it will cut it down nice and fast. The key thing is: with each step, you absolutely must get out all of the scratches left by the previous abrasive before you move up to a finer abrasive.
That's a mighty big part to polish with a Dremel. It would make life a lot easier for you if you got one of Caswell's buffing kits that you use with an electric drill. Or if this is all you plan to polish, you can buy a mandrel to fit a drill chuck and a couple of buffs for less than 20 dollars.
Richard
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