Is it white? GM had adhesion problems with their paint stickng to the primer. I sent a few customers back to the dealers for new paint (free) jobs with trucks in the late 80's early 90's. They would put 2" masking tape on the paint and rip it off so see how much paint would come off. Works better with 3M tape. The dealers would only do so many a month but would fit you in if you were on the list. They would have to strip the truck to do it right. I have seen them strip it to the body line and feather it into the old paint on the bottom. But most of the time the paint wouldn't feather and just peel.