Yes the factory solder was in was appeared to be very good condition. Seemed to have good adhesion with no cracks or visual blemishes.
The only thing that i can think would have caused this would be not cleaning the lead with some type of solvent before applying filler.
Originally Posted by baddbob
Usually bodyfillers will stick just fine to body solder but I usually apply epoxy after the stripping stage before any filler work and have never had any problems. Was the factory solder in good condition with no evidence of seperation around the edges? Usually the sail panel areas seem to hold up Ok but on most models the A-pillar to roof seam is usually bad with cracks and corrosion underneath on GM cars, not sure about the older Fords though.