There have been a lot of strange beliefs associated with WD40 over the years. Is anyone here old enough to remember when the "fact" that WD40 used on guns could/would cause the metal to develop cracks like wood does when it checks from drying? That idea was being pushed by a lot of people in the hobby. It went on for years, personal testimony of its validity, chemical explanations of why it was true and how it worked, right down to the molecular level...that theory seems to have evaporated these days, haven't heard it put forward for some long time.
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