UFO-LOW I feel your pain. Guys that are lucky enough to not have humidity just would not understand....
I would throw in a suggestion into the ring too. Use the stuff that BMW and Mercedes uses in their vehicles -- it is not a paint or an undercoating that you are familiar with. It is more of a waxy material that never gets hard. It creeps and crawls when you install it so it gets between seams and into any area that is spot welded to stop any exposed metal against the dreaded rust tin worm. Wurth makes a great product that the major OEM's use; and it is here:
Wurth Body Wax
Best of luck on your project!
Mark
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