Chrome and Brass Paint

Any of todays acrylics are very good, the only thing that I would sugest is that you prime the parts with a good quality auto paint primer first. I use a flat gray as it seems to be the best to cover.
Cheers and Good Luck!
McCaber

I've had pretty good results with some of Citadel / Games Workshop metallic paints.
http://store.us.games-workshop.com/storefront/store.us?do=Odd&odd=NewLayout&_do=DoRace&game=11

The names given to some of the colors are unique, and IMO misleading. Their "Boltgun Metal" works beautifully as "Steel" however their "Brazen Brass" is more of a copper while their "Burnished Gold" is more like brass.

They are acrylic and I have thinned them for airbrushing using isopropyl alcohol with no problems.

For chrome you might consider using some of the metallizers as they are going to give a bright, shiny finish, although it is somewhat delicate. I've used Testors with some luck, but have heard that AlClad is better.