Wanted to see what the opinions were here on the best way to finish this seam. Originally leaded of course. On some sites it is recommended to re-lead this seam, stating that body filler doesn't hold up and will crack. Others have said they use a filler with fibers in it for the roughing in of the join with a skim coat of body filler to finish up with.
I have to admit I've never tried using lead solder before.
Thanks John