pariah,
You have stumbled across something I have been researching. I have viper cans that are allly and want a mirror finish, before I start it will take a long time and the results will not last if you do not keep on top of it.
Mine were a brushed finish, so I started to wet and dry with around 850 grit, depends on the severity of any marks, one I have removed all the deep marks I use 1000 grit to remove the 850 grit marks and so on with 1200 grit, 1500 grit, 2000 grit and finally 2500 grit. I would never use Autosol metal polish to finish off because this is good for Stainless and other steels, but to compare to the above sandpaper it is approx a grit between 850 and 1000. It's to aggressive. Autosol do an ally polish in a blue bottle, I would recommend going to a chandlers cause we have a yacht and most bits are ally and they do an extensive range of polishes for this material.
Before you ask, you can lacquer the finish, but it will remove some of the mirror finish, but it will keep a good quality finish.
I hope this helps, once the bike is in pieces and had a chance to do my forks I will post pictures.
This link is the nuts
http://www.imoc.co.uk/forums/kb.php?mode=article&k=113
I hope this helps