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How about 3M body and seam sealer& spot welds.
-G-

 

Bingo! Well, nearly bingo.

Automixâ„¢ Truck Line Adhesives and Sealers


These adhesives are tested for this sort of thing. Some manufacturers use it in the factories, although I admit I do not know who.

 

Good news! My neighbor took me to his friends body shop this afternoon and they are going to fix it for me. All I have to pay for are materials. Having hook ups rocks!
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Since you can buy them would I be wrong in assuming that they are not welded in?

 

Glad you found a way to fix it! I didn't think that was too bad, and it should be cost effective to fix if you can weld. Just cut the rusted sections out and make cardboard patch templates. Transfer the templates to sheet steel and weld them in.

Want to see real bad? Here's a MGB I restored, I did all the body work.
http://www.cardomain.com/ride/2594680

 

Pretty sure they're spot-welded.

Funny- replacement floorboards are a very popular item for the VW Type 1, though of course that vehicle is not a true unibody design (it's frameless, but the entire body comes off the pan as a unit).

I've seen 'em in the parts catalog, but I didn't think we'd be seeing serious discussion of doing the job on a Miata anytime soon.

'Course, I guess the oldest of 'em will be legally able to purchase liquor next year.

Wow.

 

Its been suggested that I steal a stop sign. Put some bends in it and tuck it under the carpet.

 

Or you could make the cardboard template, liquid nails it down, and use some "great stuff" to waterproof and stiffen up that cardboard. No rust ever plus weight savings.