yeah mate for sure, i was thinking this too but my model shop didnt have anything and the guy behind the counter, said the ones i had would go straight over the silver, No undercoat needed as i try to expalin i wanted to retain that polished look through the paint, i was looking online and saw this colour chart, im sure you guys over there will have more to choose from, the real files when you look at them even though they are the same files they appear different in colour 1 is darker then the rest, i guess the fading over time, when they are sterilized they loose there paint over time back to the raw metal.
YouTube - CHROME COLOR 2
check out the red on that bust, what brand VHT or Duplicolor - Metalcast Anodized Color Paint something like that
Amazon.com: Duplicolor - Metalcast Anodized Color Paint, Yellow, 11 oz. can (MC202): Automotive