Alclad II provides a very good finish, in the various tones, although I haven't used it myself. Mainly due to the relative expense, and the somewhat involved process - if it goes wrong, it does so big style, from what I've heard and seen.
You could try the method I describe in my 'Bare Metal Made easy' thread. It can be a bit messy, but works extremely well, and has the advantage of using normal paint, also allowing many variations in tone.
Incidentally, the product mentioned in the article (SNJ Polishing Powder), is no longer available, but it's just aluminium powder anyway, and can be bought, at a very good price for a larger container, from suppliers of forensic materials, as it's used for fingerprinting. I recently bought two tubs, more than twice the contents of the original SNJ product in each, for less than the original cost of one SNJ bottle !