Great thread...too bad this wasn't around when I was detailing a Lotus Super 7. I've only had frustration with aluminum. One of my clients had all sorts of toys for aluminum polishing, and he recommended I read-up on the Eastwood Company for aluminum polishing supplies. Nevetheless, I had access to three different levels of rouge, a power drill set of polishing "balls" (something like this, just smaller:
Felt Polishing Bob Set) and flitz metal polish. After hours of trying to use the rouge, I went to the flitz polish, a drill, and the polishing attachments and the results were better. This was on an F40-style wheel (on a Lotus elan). My biggest problem though were holograms. How can we prevent these when drill-buffing a wheel?