You can go to the store and buy "boiled linseed oil" to coat the raw aluminum if you polish it out raw. You just put some of that on a rag and wipe it around to coat it and it will preserve it for a long time but you will eventually have to put a little more on from time to time. The stuff costs $20 or so at my local Lowes store for a gallon. You can buy a quart of it as well for like $8 I think. You will hardly use any of it so buy small. And don't let the rags lie around in a pile because they will catch on fire so be careful with how you dispose of them.
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