Our story so far:
The outside (emphasize: NOT the cooking surface) of a cast iron skillet has rusted.
I've cleaned the rust off with an SOS pad, water, and steel wool. and dried it as thoroughly as I can.
What is the next step to protect the outside (again, NOT the cooking surface) for the future?
I'm guessing some kind of oil and maybe putting in a low oven for some time.
But what kind of oil? neutral cooking oil? something else?
thanks in advance