I undertsand what wd 40 is supposed to do but from my experiences with it it does not live up to those standards. Spray down a bare metal autobody part with wd-40 and set it outside for a day or two. Just the moisture from the morning dew causes surface rust. When rodding my 30 model a sedan that was the problem I ran into. So I started using an oil soaked rag. I know it is not the same as an electrical part but still the moisture was not displaced. That is an extreme test. I have had body parts flashrusted inside the shop when I walked in the next day to continue work, just from the moisture in the air. Sorry to get off of the subject.