…and sanded down smooth. Our method yields panels that need VERY little filler, but they do need just a smudge that will be mostly sanded off. Welding them in with the MIG in the over-lapped fashion will leave a .040 step in the surface that will ned to be filled, and will require just a bit more filler, but it is a very acceptable amount and you should not be worried about doing the conversion that way instead. What you DO NOT want to do is attempt to recreate our butt-welded methood with a MIG welder – that will produce heat and warpage of EPIC proportions – DON’T DO IT!!!