I brought my 2014 Sierra in for service in January because of frame rust. I knew it was a joke when they said it would only be an hour before it was ready. Now two months later all of the rust is showing through again. I called GMC's complaint number, and they just connected me back to the dealership who said I could bring it back in to have it re-coated. My dealership is certainly not removing and treating the rust areas before applying the seal coat, just spraying it black and giving it back to the customer.
