Renaissance Wax. Museums use it for metal surface preservation, among other things.
Brownell's and Amazon sell it.
Renaissance Wax is amazing. Can't tell it is there, but it prevents rust for a long time.
I use it on knives, as well as firearms (wood and metal).
It is pricey per ounce, but you use VERY little, so a can will last a LONG time.
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https://www.amazon.com/CAS-Hanwei-P...;qid=1557545408&s=gateway&sr=8-4[/img]
I think I bought my little jar about 9 or 10 years ago, and I don't expect to ever need another jar -- a little does go a LONG way.
John
