I'm finally tackling the floors in my 90 GW. Everything is going great; the rust was only on the surface and came off pretty easily. I'm planning to use rust converter for the few pitted areas and then some type of rust preventing/encapsulating paint.
My question: a seam has come apart where the floorpan meets the wheel well and the cargo area approximately along the yellow line in the picture (the pic was taken before the area was cleaned up, and yes, that was a trowel to scoop out the dirt/junk that had accumulated). There was surface rust where the edges used to connect. I wanted to cut out and weld, but it seems like it may be a complex job considering the seams runs along 3-4 pieces of metal. Would it be sufficient to use a seam sealer after coating the metal with rust converter and paint? Or should I try to weld the crack back together and then use sealer over that?