I'm attempting to restore a Fatso wood heater/stove. This was in an old family barn so some parts are more rusty than others. I'd like to polish the cast iron after it's cleaned up to seal it a bit, and use this old heater on our back porch. I recently purchased Imperial Stove Polish Paste, and wondered if anyone has experience with it? Also, here are a few parts I've scrubbed rust off of. How "rust free" do they need to be before polishing? I'm brand new to all of this, so any information is appreciated. Thanks!