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I am nearing the end of my blocking phase and starting to think about making reservations for the spray booth I intend to rent. I am doing a color change. I removed the doors in the sanding process and cleaned, primed and prepared the door jambs. I reinstalled them to check my alignments and will be removing them again. I have thought it would make the process easier if I painted the jambs and the inside of the doors in my garage then install the doors before painting the rest of the car. My primary concern is that I am going to damage something when I reinstall them. So if I paint with them on I avoid the issue.
You can do it that way...Painting them and then painting the exterior...the only issue will be possible excessive overspray in/on the hinge area...and possible tape lines. If you can live with that...then pre-paint them.
I paint them off...so the jambs and hinges are painted well along with the inside of the doors...then install them again so I can make sure the exterior color matches...then I remove them to clear everything with no tape lines.
What DUB is saying mostly concerns shooting metallic colors but can affect some solids as well. Achieving a uniform metallic dispersion in the basecoats can be difficult when the car's parts are painted "piecemeal" as opposed to assembled. Yhis is because even small variations in gun angle, gun speed, thickness of coats and other factors can alter the way the metallic settles in the paint which alters the way the parts look when finished and assembled. Painting the jambs, then assembling the car to apply exterior basecoat, taking it apart to ensure clear is evenly applied, then putting the car all back together again is a good way to get a "show quality" finish where all the parts look exactly the same color and shine from any angle, in any light. It also a lot of work. It is possible to get a "decent" result without disassembly, but you will always know it could have looked much better if it had been done the hard way. I have a "decent" finish on my car and that's OK with me since I intend to drive the crap out of it, and I know it will get dinged and stone chipped.... you may want a different result.
To make sure I understand, you are reinstalling the door to compare the color on the door to the fenders?
I believe you have read the other post being listed . And it should describe what I meant in greater detail.
I do this process on both solid and metallic colors. For obvious reasons of metallic structure and proper hiding in solid colors....as markids77 explained.