If you're worried about corrosion enough that you want to spray it with something, use Corrosion X, ACF 50, or LPS 3. All three of those products "creep" after you spray them on metal. You should be able to find at least one of them at a good hardware store or a boat shop. All three are high quality and do basically the same thing. (WD-40 is pretty good for what you want to do but these three products are great.) After you spray the thing, wipe it down with a clean, dry cloth or paper towel and then let it sit for a few days for the rest of the residue. That'll probably over protect it for life...