I believe a good number of people have reported using Model Master Metalizer on them, and that is what I used as well. Here's a link to show what the can looks like, but I got mine from a local hobby shop.
http://www.modelcars.com/model-master-metalizer-lacquer-titanium-spray.html
The one major complaint is that it is pretty fragile, even after dry. You can't use tape to mask it, and they recommend handling with cotton gloves to avoid leaving permanent fingerprints. I haven't found it to be a problem, though.
Here's a decent picture of how mine turned out, but they look more metallic in person.
slide2.jpg
Bristow, VA
