Seeing opportunity, said dealer purchased a local autobody facility that had recently installed new booths - and kept his own for the lengthy, heavy repairs.
Service writers were told to look for signs of delamination, and tell the customer that GM would do the car over, for free. Don't think they ever got turned down.
Dealer would put the customer in a fresh loaner while their original car was being painted. Customer would return to a practically 'new' car. "Ya know, Bob, now that this is painted, and it's been serviced here, I can give you a really good trade in price..."
Boom... customer flips into the new loaner, dealer gets a fresh used car for the front line (more profitable than a new car sale.)