WD40 repels moisture and also a good lubricant for assembly. Spray the whole body down for assembly and wrap them in a WD40 soaked rag before you store them. We spray all machines parts after they are done and stretch wrap them for pick up.
I've used WD-40 for some things, but also heard it gets sticky after awhile (on door lock cylinders). Would not think it is good to use on parts that won't be in use for quite some time.