Check out Alclad II metalizer paints and finishes. They have lots of different metal finishes from chrome to stainless to aluminum, plus window tints. It's a multi-step process where the primer or base coat color can subtly affect the finish coat color.
AK Interactive has a similar system as well. You can find plenty of youtube video tutorials for both as well as videos comparing results for both products. Both products are very common with military models but obviously can be used for anything needing a realistic metal finish.
OGR member AntonioFP45 has a thread discussing the use of Alclad II. I originally saw his posts on the old Atlas forum (in HO) and after that on the Atlas Rescue Forum. You may find additional information on the process if you search those other forums.
I hope this gives you some ideas. Who knows, perhaps you local supplier will recommend one or the other.
Jim
