Hi Bob.......IMO, you have a couple of options.
If the floor is rusted but together.......even lacey, like my TR3A trunk
floor....., you could do a POR-15 repair.
The other option would be to replace with sheet metal. This means buying new
floor pans, cutting out the floor with a Saws-all (leave 2" at the sill,
firewall and aft cockpit).
Trial fit the floor, then drill 1/8" to 3/16" diameter holes 3" apart around
the periphery 1" in from the edge. drop in the floor and fill the holes with
weld, making sure there is intimate contact between floor pan and body. Seam
seal when finished. Viola....done.
My .02
Bob Stahlbush
66MGB GHN 3L 78708
60 TR3A TS 81398 L
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