All right guys I need some help. I have a 59 buick that has bubbles popping up in the rear fender lip. It is double walled there. If I cut it out and weld it I can't get to the back side to coat it to prevent it from rusting. How do I go about this. If I cut it out and weld do I grind the weld all the way smooth or leave a small amout of weld for strength. Again I can't get to the back side to weld. Am I making this too hard. It's going to be a nice custom and don't want to address this problem again in 5 years. Thanks TP