what's the correct way to coat floorpans/tubs/trunk

[Travis77]

I need some advice on what steps I must do after installing an entire floor and trunk.
I just built some new tubs for my mustang and used some pre primed sheetmetal. I wanted to use this to keep the flash rust to a minimum. I plan to continue using this on the rest of the floor area. Once I grind this primer off at the weld location, what should I put on the bare metal and over the weld? Then what should I coat the rest of the pre-primed surface with(epoxy or self etching)? I am referring to the inside of the car BTW. My intensions are to go over the(whatever primer advised) with dynamat. Meaning that I most likely would not be using filler.