I used PPG on my SS Gold base with a Red (Cant remember wich red) then 3 coats of Clear. I spoke with PPG rep and did exactly what they said. I did my car a little over a year ago and have never sanded and wheeled the car, it still looks great with no drying down (5 coats of Gold,7 coats of red and 3of clear). Make sure your car is all one color before you start it will show if it is not. Hope this helps. Good luck it is worth doing.
ps: PPG told me it would only take 2 or 3 coats of each color keep that in mind Mine should have had 1 or 2 more Red but I ran out again