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Here's a classic example of where a simple patch panel won't cut it. The quarter on this '68 Camaro has been hit at least once, probably more, and subjected to some hideous bodywork. "Something like this, with 1/2 to 3/4 inch of mud, is totally unacceptable. Anything more than 1/8 inch is too much," explains Austin. "Work like this is common with lots of backyard mechanics and even some shops because it's a lot easier to load a car up with $25-a-gallon Bondo than it is to learn how to replace a body panel. I always recommend replacing the entire quarter-panel because that enables you to take care of all the dents and rust at the same time. Patch panels can start cracking between the welds if you don't do it right. If you put a full quarter-panel on, you only have a tiny amount of filler at the factory seam near the roof, and the amount of money you save in labor can more than make up the difference in price."