I had a non-Pontiac car painted last year. It was all apart (doors, trunk, hood, fenders) to start with. First they did the door jambs, back sides and edges of panels in the color coat. It was then assembled and sprayed overall with the color coat, then blown apart again for the clear coat. Finally, everything was color sanded and buffed, put back together, and then given a final buff after it was assembled.
It was a lot of work but it guaranteed the paint would look the same across panels and it looks fantastic. This car is a black metallic, which made it more important to do it this way - the paint needs to go on at the same angle, if for example the doors had been off the car and laying on stands, the metallic may not have matched exactly.
I also have an old pickup truck that's a medium blue non-metallic; the various parts were painted separately at different times, and in the right light you can see a difference even though all the paint came out of the same can.
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