GM has had many paint issues going "at least" back to the early to mid-80's,back then it was due to bad primer, I ordered a top line Olds Cutlass Supreme Brougham from the factory in 1984, in a deep Burgundy color.A year later, I waxed and entirely buffed the whole car in the shade, and went in for lunch. Came out, and it looked like the neighbour had cut his lawn and sprayed the clippings all over my car.....but they wouldn't wipe off! Why, because they were cracks filled with white wax. The battle between GM and myself ensued, and lasted well over 6 months....I simply would not let go. In the end, the car was in the shop being entirely stripped to bare metal, and just get moving forward, I agreed to pay 25%, while they paid 75%. So I won and lost, all at the same time.
Then don't forget the Chevy and GMC Trucks of the Mid-80's for the same reason....driving down the street with dinner plate sized pieces of paint missing from all kinds of areas. Shame Shame!