Don---Bronzes and coppers are just about the most transparent metallics that there are. When I was doing a lot of custom painting in the early eighties/late seventies, I used to get some really wild effects on custom paint jobs by using 3 or 4 different shades of primer on a car to lay out flames, panels, etcetera, then overlaying everything with about 5 coats of copper/bronze paint. The only way you could get a uniform colour on the entire vehicle was to paint everything a solid white colour first, then spray the copper/bronze over it. I'm not really up to date on the modern paint chemistries, but I know thats the way it worked with acrylic enamels. The yellow base/clear that I used on my RPU was the same.---Brian