I am on my second airplane build and have settled on a corrosion protection plan that seems quick easy and effective to me. I alway have a quart of DuPont VeriPrime self etching primer and activator available in the shop. For small and large parts both interior and exterior skins, I will clean up with a hand squirt bottle of diluted degreaser solution. And while that is drying, mix up a small batch of VeriPrime. I mix it thin, then brush on with sponge brushes. For small parts I mix up just a thimblefull. I will transfer the primer into my mixing cup with my primer stir stick so I don't contaminate the lip of the can so it seals back up nicely. The primer dries very quickly and is very forgiving of fingerprints and other contamination if my cleaning isn't the best. It give a clean, thin, light protective coating, quickly and inexpensively.
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