Any members involved in the Paint and Body Profession? Or used to be or have knowledge to answer a question?
I have a fair knowledge but not much on newer foreign stuff. Maybe I can answer your questions.
R
If it's basecoat/clearcoat 2K paint system it's probably a good idea to repaint the whole thing. The basecoat (colored coat) chemically reacts with the clearcoat put on top of it. It becomes one in a manner of speaking. Basecoat will never cure completely unless that clearcoat is put on top in the required time interval (usually within 24 hours).
I took a 2 year autobody program in high school to include going through Du Pont and PPG finishing programs, but also was also working in aerospace finishing with all manner of epoxy aircraft paints long after that. Also have painted a few cars and motorcycles.
Re-clearcoat the whole truck? No. Re-clearcoat the whole panel? It depends on how anal you are about it.If a truck is starting to lose its clear coat, does it mean the entire truck needs re clear coated?
It very difficult if not impossible to blend clearcoat finishes like we could when we were spraying acrylic lacquer and enamels paints. It's repaint the entire panel in a repair usually. Back in the day you could blend them and never know it was done.Re-clearcoat the whole truck? No. Re-clearcoat the whole panel? It depends on how anal you are about it.
My old boss got a rock chip in the paint on his car, so he tried his hand at repairing it himself, but he could never get the transition blended to his satisfaction (it looked OK, but he could still feel the transition from the original paint/clearcoat to the new), so he took it to a trusted body shop. They told him that you just can't get that transition perfect on clearcoat finishes, so they always re-clear the entire panel. (I don't think they said repaint, but it has been about a decade, and I can no longer ask him any questions.)
They have the answers
But if parts of it are peeling then it's going to give you problems in other areas especially if paint is fading or faded. Late 90s clear coat on multiple manufacturers have been a big problem.
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