Depends on the color. If it is a solid color like black you could paint off the car and then install. Just have to be extra carefull when installing. Tape edges etc. If it is a metallic or pearl etc. I would spray on the car for uniform finish. small changes in air pressure paint mixing etc can show up if sprayed at different times and if the panels are not sprayed as they mount to the vehicle. Not sure about your trim piece maybe someone else will chime in. Post some pictures I would love to see the car!!
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