Well my process for the badges was filler primer, then sand and repeat, before using a silver metallic enamel spray from wilko's http://www.wilko.com/specialist-pain...l/invt/0413840
Its cheap and cheerful and gives a very good chrome finish, apparently(according to the reviews) far better than the actual chrome spray they sell. After that I then sprayed them with a clear lacquer, which surprising dulled down the finish to more of a dull silver metal look. This was probably due to the silver being enamel and the clear lacquer being cellulose, but a lucky accident for me as I actually prefer the duller finish over the high chrome, at least for the badges.
Not the final silver coat, but this is what the paint looked like after one coat of the wilko silver.
There is another method too, I could go as far as to create molds of the badges in silicone, and then using a epoxy resin mixed with an aluminium oxide dye, create the badges that way. There's also the possibility with this method, to do it in stages where you could have a variety of colours and transparency. for instance red at the front, with black at the back. Something like this http://lodenemblems.com/sites/defaul...?itok=eNLQlCCJ