Looks nice Andy. Given how rusty the cars actually were, I think you over-worried a little bit over some future owner of the cars. I personally wouldn't have given it much thought, given that most "collectors" are looking for items in better condition. But that said, it also shows you're a thoughtful person.
I also use Krylon spray cans amongst many other brands, so long as I'm using a plastic safe primer first. And I agree, the Krylon does dry quickly.
A little pointer: I always wipe the spray nozzle with isopropyl alcohol after a spray, to help reduce the chance of clogging. I also use a small plastic 35mm film container, filled with isopropyl alcohol to soak the nozzle on brands of paint that I find are more prone to clogging nozzles.
