[LongBox]

I have found a spray product from a buddy who worked at the hangars at the local airport. It is used to prevent corrosion on airplanes. It is called "Ardox" or something like that. I used it 28 years ago on an old MG I had, and it totally prevented any corrosion on the steel body.

I suggest finding an airframe mechanic, and asking him what they use in the local hangars.

If y0u need the exact name, let me know, and I'll go out to the garage and find one of the cans. It's an aerosol spray can.