Body/paint floor questions

4spdragtop said

Thanks for reply, I cant remember if its plug welded from top side. Should it be? Also, I would imagine seam sealer on both sides of seam?
I was worried that I may have to take it all down to bare metal before priming.
No more $$ to sink into it, so I gotta learn to finish it.(never welded or painted before)
Thanks again.

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Got some inside pics? Looks like some plug weld spots from underneath... Who did that welding? Might not need any more.
I wanted my floorpan repairs sealed from underneath too. Didn't trust seam sealer for exterior. Used Black Jack Neoprene Roofing caulk. Stuff sticks to anything. Cures flexible and while I wouldn't expect a fine finish, I have undercoated and painted over it with good results..