Monte,
I've been using S100 Corrosion Protectant for the past year or so with pretty good results. I received it in a kit years ago and decided to give it a try. My garage leaks like a sieve and San Diego can get pretty damp this time of year. I noticed only a slight indication of fuzz on my sliders the other day but remembered I forgot to treat them with S100 Protectant after the resto. All unpainted engine covers are staying nice and clear where I treated them. I'm not a big fan of S100 or affiliated in any way. Just wanted to share if you have some laying around.
-Mike V.