i really wouldnt seam weld the roof supports, you may warp the roof metal, and theres not much point to weld up there
just clean out all the seam sealer (READ: sealer, it does not hold the car together) .. and weld.. be aware of whats on the other side of the material.
wire wheels on a drill work well for seam sealer, use dry ice and heatgun/scraper for tar
leave gaps between the welds, and cool the metal between welds...
these welds are probably a litle long, but its a thicker area so its fine.
my gti
back side
