Quote Originally Posted by Matt93SE View Post

Down here in Houston area, stuff rusts in minutes if left outside. I have a $1500 stack of Coleman Racing rotors that are junk because I left them at the base of the garage door (inside the garage) overnight after unloading the truck.

No problem with a bit of surface rust on a rotor. Scour it off with a rotary pad or you can run it as is and the pads will do the work for you. I've put on some fairly rusty rotors with no issue although I would have chosen to sand them or even turn them down if I'd had the option.