I'll share what I did with my F-12 tank. It too had 2 screws and bondo on the bottom for a repair.
I emptied the tank and removed ALL fittings, caps, etc. and I also removed the repair. I then let the tank sit in the hot sun for a few days, which "cooked" out all the fuel that was in it.
Tank was cleaned and paint/rust was removed both inside and out. Repair area was rust stabilized and then filled in with JB weld, and sanded/formed to contour. I then used an epoxy tank liner on it (following the directions). prepped, primed, and painted.
No leaks, no peeling, and no bubbles. for smaller repairs to sheet metal and gas tanks (dents). I prefer JB weld vs. bondo. It is more expensive, but I feel it is a better solution for parts that sustain lots of vibration. The only body filler product I use is spot putty to fill any tiny bubble holes in the JB weld and fine feathering. I would be surpised if the spot putty was thicker than 1/64" in any of my applications.
there are good suggestions in this thread. Use the one you are most comfortable with doing. Brazing, solder, MIG weld are all viable options as well. It all depends upon what your capabilities are and the task at hand.
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