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Originally Posted by dlavery
I would NOT recommend using WD-40 for anything other than a last resort, once in a while solution. It is a great penetrating oil for freeing stuck parts, but it is not intended as a cutting oil. Because it is so thin, it has a lot of volatiles that will evaporate very quickly, thus it should not be used in areas that are not very well ventilated. It will also leave residues on the work surfaces that can be a real pain to clean off later.
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In high school, we almost always used WD-40 for cutting (both in shop class and in FIRST) ... rather than it being the last resort, any other cutting fluid was deemed that. I never realized that it was potentially hazardous to your health, flammable, and not the best solution.
Thanks for the info!