I'm looking at shooting testors laquer emerald green on a couple different bodys. I'm wondering what color primer should I put down? On the lamborghini I just painted flamming orange , I used gray but when I went to shoot the underside of the engine cover I didn't primer and in hindsight I should have primered the whole car in white. Should I use white for the green? I thought I read somewhere to use silver for metallics is that true?