You can use metalizers. They are laquer paints that dry to a true metal-looking finish. There are "Buffing" and "Non-Buffing" metalizers. The buffing kind must be buffed after it dries to get a good shine.
I don't use a lot of it, and the brand that I have used is Testors in rattle cans so I can spray it outside. They are laquers so the fumes can be pretty bad. I'd recommend the use of a respirator while painting with them.
Alclad is supposed to be much better than Testors but I have never used it. Reportedly the shine will rub off and the surface is subject to turning black because of fingerprints, but I haven't had that problem with the rattle can Testors paints yet. Search the forum for metalizers and you'll find a lot of info about using them. Done right they will give a fantastic finish.