I"ve used Eezox for over 30 years and it's as good as you can get for rust prevention in the humid NE summers and keeping semi-autos running in cold NE winters!
Corrosion X works about the same, only maybe a little bit better. If it is good enough for Phil out on the Alaska Pen., I take that as "good enough". I switched to it on his recommendation of it here on the Campfire, when I ran out of Eezox, and never looked back. Nothing wrong with Eezox tho.
I've several bottles of C-X, enough probably to outlast me - stocked up, just in case....
They both work best applied to warm metal, allowed to dry, and 2nd or 3rd coats added. Blued, stainless, or parkerized, it's (they both) are good on all.
