Many a wife in the south would cover you with boiling rice/grits for fouling their oven with that method. Now, if you have a self cleaning oven and your dealing with solid shot, there would be no need for Parafin.If it's Cast Iron; pretend it's a Dutch Oven.
Lightly scrub off surface Rust with Soap & Hot Water, dry in a warm oven, then get it hot in the oven & coat lightly with Paraffin Wax.
Trust me, if that parafin wax ignites, resulting in sooty smoke and waxy smell SHE WILL KNOW, no matter how hard you try to air out and clean the kitchen.That is only if she finds out what I have done to the oven! Of course the last time i fooled with the kitchen was when I was soaking gun parts in oil, ……. In her cooking pots! As they say “that did not end well”!