If your buying spray paint keep in mind most are lacquer. I bought the argent silver from Eastwood's. It's a real pain to use as it dries so fast it's very difficult to get a smooth finish. I finally had mine powder coated because of the finish. There is a place in Stockton, Ca that sells enamel spray cans of argent which would give you a longer working time. Here's a link.
http://www.jimdyerchevyclassics.com/