Original floor pans and Por15

Mopar Al said

You can also, on the inside, paint with Por, Lay down fiberglass cloth, Paint again with Por. No dry time between coats.

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This is exactly what I did to my floorboards in the GTX 20 years ago and they are still as good today as they were then. A little bit of fiberglass cloth to reinforce the thin spots will handle it well. I even repaired a fiberglass canoe that had been split completely down the center of the bow with just POR15 as the resin and fiberglass cloth. Stronger that the regular resin ever would have been.