A couple I do work for has an manhole cover with the name of the casting company that they are related to. When I say "manhole" I have to add that it is not as large as a common manhole cover. It's about 18" in diameter and 2" thick.
Now the problem.... humidity has created surface rust on the cover. They want it cleaned up and made to withstand humidity without rusting again.
So, to remove the rust I'm going to go the Naval Jelly route with a brass brush. It's just surface rust and not much at that.
To keep it from rusting again I've got two ideas. One is season it in the oven with cooking oil like a cast iron pan. The other is to put stove black on it and also heat it on the oven.
Thoughts?
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