[dsraven]

same same with PTC, epoxy it as soon as possible. is buffs off fairly easily when cured. you don't need to sand it to bare metal for filler, the filler will stick fine to the epoxy and some say it is better because the filler can hold condensation so if it is on top of epoxy the metal is sealed from that.
man, you have some serious hammer and dolly work to do on that roof. or just weld the holes closed, epoxy it, fill the crap out of it and drive it for now. paint it after the house is done. you never know when a something accidentally dings the roof when loading at the lumber yard or hauling garbage anyway. throw a new roof panel on later.