Question for the Experienced Body and Paint Guys

You can pre paint panels. But final paint is always after it is assembled. Black can be final panel painted and match. Reverse mask the jams to eliminate a paint edge.

Metallics and all colors will always have a color difference due to the way the metallics and colors lay and sink. Even if you spray the whole car the sides will fade to a slight metallic change difference then the top, I was a finish spray painter at Mack trucks. there were two painters per truck , One per side. Some metallic paints one person would give a quick dust coat on both sides so the metallic laid the same. Silver and gold were the worst to cover evenly.

So my answer would be always repaint the car assembled. you'll end up with a nice even match on panels

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