After work I decided to do something about this seam. I may be the only one to feel like this but I have ALWAYS hated this seam. It makes me angry every time I see it....
Used a twisted wire to pull most of the of the filler out, finished by using the dental pic to dig out the remaining.
Very slowly filling the gap. After each pass (~2" space per weld along the seam) I grind the welds down and give them a few 'tap taps' with the hammer.
I just got to the point where things started to go good and had to quit to go cook dinner. I took one last pic and had to run. I still have a bit of work to do but its filled and without warping! I will have to do some more filling; the original roof seam from the factory was not 100% consistent (gaining lap in the center, almost where a rear mount brake light would go on a later model truck). This may of been a factory oversight or just how they were all made; I dont know. It wont be hard to massage it so it flows nice.....no biggie but something to do.
Ill have this finished up tomorrow.
~JH