JB weld pits in floor pan?
Apparently a bit late to this party, but I had some small perforations just like the OP pictures show, as well as a pretty bad drain hole. A previous owner had even used a little Bondo under the gas pedal.
I cleaned things up with a wire wheel and went over the areas with a little rust killer, then patched them up with JB Weld. The JB Weld stuck to the Rust Killer just fine, and the paint stuck to the JB Weld just fine.
9 years later, everything is still SOLID AS A ROCK, above and below..