Upol strong hold panel adhesive... Do some research on this stuff. I used the 60 minute glue on both my rear quarters and sills... It's a 2 part panel glue with glass beads in it so it doesn't all squeez out when clamped in position.. No welding no warping no grinding.... Perfecto! This stuff is quit expensive and most of the new cars are out together with this stuff these days... Was about $80 for 200ml and $40 for the gun which did one silk and rear quarter plus I had some extra left over..,