Not Ranked
I've had the 3M on my car since new in 04 and, while it isn't white, I've seen absolutely no indication of yellowing. Had to pull one of the rear fender spats off to repair some damage last Oct. and the material was still clear.
I would tend to agree with BillK that the shop may not be using a true 3M product. If they are have them submit a warranty claim.
DonC
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