Just FYI, you can get POR15 on Epay from Eastwood, sometimes they have can & even full kits on sale at much less than most folks. The kit is a the best buy, the clean & prep chemicals are all there, & one small can of POR puts down a lot of coverage.
Simple prep work, and if you have any pinholes, or even screw holes you want to fill in just lay down a little fiberglass mat and paint over it like resin. Have known people to fix badly rusted floors that way too. Dries to a smooth glossy coat that is darned near bullet proof too.
I have it on my trans cover in the cab, diff cover, oil pan, and valve cover, and I'm planning on doing the whole interior under the dash & behind the seat/tank.

1956 GMC 370 dump " 'Tater "
1970 VW Volksrod "the Black Bomber"
2007 Chevy Avalanche
2020 Jeep Cherokee Trailhawk,
2005 Harley Davidson FLHTCUI

I dig all cars, old and new, whether they were hammered out of American iron, German steel, or Japanese tin cans. Being unable to appreciate them all is missing out on a world of great things.
But thats just MY opinion! :P