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Find out how much of the car was actually repainted. If its just the bumper then you may be able to forgive it (you can plan to repaint it later). When you get into body panels that have been repainted then its a cause of concern, as you want to know what the problem was that warranted body parts to get repainted this soon.

Try to be a little objective with the paint, as GM paint isn't perfect. Its not uncommon to see shade differences between panels and the bumper. A good car should have a uniform shade between panels, however. If the quality is less than what you're expecting then perhaps you should let it go back before you get too attached to it. You may find another ZL that could make you happier.

Good luck.