^^^ +5

I keep my bikes dry and sheltered - usually. My 1982 PUCH Reynold's 531 frame/fork has not been treated with a frame-saver compound. There is not a single patch of rust to be found. But if you live in high-humidity or ride through water - go for it.

Aluminum frames are not susceptible to surface-rust past a single layer of aluminum oxide. And the single layer of aluminum oxide protects the frame (and components) from further oxidation.