Is there a coating that can be applied to blued barrels / actions that makes them more rustproof? I have a blued 338 Win mag, that shoots very well, which I'd like to take to Alaska next year. With the weather up there I'd like more rust resistance (like a stainless). I don't want to get a stainless rifle when I have one that shoots very well already. However, I also don't want the thing to rust out on me either.
Thanks for the help.

wax has always worked best for me. Rennasanc ewax is supposed to be a little better than the rest, plus the can looks real cool. But it costs $20 for a small can and regular Johnson's paste wax costs $6 for a large can and has always worked just was well for me. But man, That Ren Wax can sure does look cool