I had to do very similar work to mine, both passenger and driver. You might consider doing a
seam sealer after you patch the metal. It will cover and protect everything, as well as fill any tiny holes that you missed. I didn't do it everywhere, just the areas I patched and areas where the metal seemed thin.
I don't know if POR-15 sticks to it or not. I sprayed my interior with epoxy primer since I had sandblasted it down to bare metal. Worked fantastic for me. But the sandblasting was probably a mistake....I just now finished getting the last of the sand out of the interior when I took the dash out. Three years later.
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