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Why not do both, like I do. Assemble the car, do all the body work tape off the car, accept the parts you want to paint. I just did a 65 Mustang convertible in black and it is perfect. No rush, no worries this way



Because black is the easiest color to do that way, but most of the time you can tell if you look close.
It's tough to get paint to flow the exact same way day to day most times because of conditions. There are many things that could be different day to day.