Well. I'm kind of new-ish to the site, but I've been customizing for a long while, and I have done some auto painting in the past, so if you're looking to get a real auto shine to the figure, just use real auto paints. There are numerous paces online that you can get paints from, or even places like Pepboys and O'Riley's auto's carry paints as well. Now, as for the type of paint, I would probably go with what they call a polyurathane paint, and that's specifically designed FOR the plastic parts of a car, but also adheres to the metals as well. You can probably go to a local auto body shop, and ask them if you can pay them to mix a few ounces of which colors you want. I'm sure they will be more than OK with doing so as long as they are getting paid to do it
Hope this helps a little.