^^This. When doing stuff like that, it is better to take a little off at a time versus trying to rush it. I was in a hurry fixing a couple of rock chips on my front bumper..needless to say, I ended up having to respray the whole thing!
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I know your pain but it could definitely be much worse than what it is. What I would do: remove the leftover glue, touch up the chip (let it dry for at least a few days) then stick on a new "z", covering as much of the chip as possible without it looking odd. Should be as good as new
