Recently I installed a new RH side AMD quarter panel to my 72 Camaro. To remove the old quarter I used a propane torch to get the lead out where the roof and quarter meet. Then I drilled out the spot welds, and cut through the brass welded spots with a cutoff tool. When I installed the new quarter panel I used those same spot weld holes plus I stitch welded the entire seam. My question is since I stitch welded the seam do I still need to put lead solder in that area, or can fiberglass filler be used? What about the spots that had brass, do I have to weld in that as well? This is my first quarter panel that's why I am asking for advice.