During my annual waxing, I found I had 2 bad spots in the paint on my C2 Corvette. One in the left front from a minor parking lot incident, and another, smaller one one the right rear quarter. The car was painted with basecoat/clearcoat about 12 years ago. I purchased the matching basecoat/clearcoat in spray cans and proceeded to attempt to fix the problems. I first did the front, and after a false start or two, it came out quite well, if I do say so myself. The paint match was amazingly good, and after I sanded out a run or two in the clear, I was complete satisfied with the results. Now for the small flaw in the rear. After prepping the area, I tried to put down the first coat of basecoat. It seemed to react with what was on the car. The spot ended up being about 1/2" X 1" after I got everything smoothed out. It kind of "bubbled up" around the prepared spot. I did it twice, being careful to clean everything, but it did it the second time too. I think I need something to seal the area before I put on the basecoat. I had absolutely no trouble with this in the front; all I can think of is that the defect in the back is deeper and got down to some layer of something that I didn't hit in the front. I am attaching a crappy cell phone picture of the area, so you can see what's happening. Anyone out there got any ideas about what's going on here? Is there some product that will seal this and stop the conflict in materials? (Preferably in a spray can.) Any help will be appreciated.