[jaros44sr]

Basically the weld turns into a spot weld, but you should try to weld top and bottom. When flanged, the metal is double thick and you should be able to tack it without fear of burn thru.

I found that the metal becomes thinner on the grinding step, as you will hit the sheetmetal with the wheel, thus reducing the thickness. You will see the metal turn blue and then you want to stay clear of that spot. If you grind only the weld with a flapper wheel and then come back with a rotary grinder, you are only removing the extra weld matrl. They look like carbide burrs and mount in a collet on an air tool. They can spin high RPM's so watch your eyes...

You can still come back and put a layer of seam sealer in the crack area, but if you put enough tacks along the seam, top and bottom, it should be water tight. I'll post up pics. of exactly how its done, when I get back from WHEEEELIN

Thanks for the comps., any help I can be, I'm always sitting right here..... J.

Yes always use weldable primer, it will give the bare metal between the flanges some protection.

Dang it takes a long time to type what I think...