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I have personally seen a 69 Vette that didn't need color sanding. It was an absolute freak of nature by the painters own admission. He had never had a paint job come out that nice, it was sort of one of those one in a million things.
After talking to the painter again, he clarified some things.
Because my car had very few stress cracks he, used the current paint as his first block coat.
If he finds any body filler he will remove it and replace with fiberglass.
After repairs, he will shot the primer block it twice.
At least two color coats.
At least two clear coats and wet sand, and polish
He doesn't wet sand the primer coats.
Picts attached
Just think about it. If you have orange peel in the primer coat, then it will transfer to the color coat. Sure, some peaks and valleys may be filled in, but the primer coat is the "easy to sand" coat, so sand the primer to a smooth surface in prep for the color/clear. And, why build your total paint mils with primer. Get it flat, and then color/clear, and you have more to work with on the color sanding.
The last thing in the world you want is try to color sand, and get into the primer or base. You're screwed then. I'd rather color sand on the clear.
It doesn't matter how good someone is with a gun, you will need to wetsand and buff to get the mirror-like finish. Paint is atomized and propelled by highly compressed air onto the surface and will be by nature of this process slightly imperfect giving it an orange peel effect. The degree of orange peel is directly proportional to how well atomized the paint is when sprayed. In short, sprayed paint surfaces are all imperfect and to get the mirror-like finish, the surface must be made perfectly flat by wet-sending and buffing.
It doesn't matter how good someone is with a gun, you will need to wetsand and buff to get the mirror-like finish. Paint is atomized and propelled by highly compressed air onto the surface and will be by nature of this process slightly imperfect giving it an orange peel effect. The degree of orange peel is directly proportional to how well atomized the paint is when sprayed. In short, sprayed paint surfaces are all imperfect and to get the mirror-like finish, the surface must be made perfectly flat by wet-sending and buffing.
At this point, I'm sure something is getting wet sanded. I am not sure if it is the color coats, the clear coats and/or both. I was there a week ago and he was working on a motorcycle gas tank with pin strips. You could not feel the strips and the strips looked like they were IN the paint. NOT on the paint.