How do you guys finish off the floor seams after you butt weld 2 pieces of floor together.. I finished welding and grinding it as smooth as I can get it. What do you use to fill the real fine pinholes left from the welding.

GM seam sealer over both sides?

Then I can paint over the seam sealer?

Then I can paint over the seam sealer?
Yes, you should put an etch primer down over the bare metal before applying caulk.