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Old December 25, 2011, 06:49 AM   #14
Clark
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Join Date: December 4, 1999
Location: WA, the ever blue state
Posts: 2,897
Remember Vapor pressure from high school chemistry? College chemistry?

http://en.wikipedia.org/wiki/Vapor_pressure

Anyway, oil has a vapor pressure, and so it evaporates in our atmosphere.
After it has evaporated, it is no longer protecting the steel.

So if I rub oil on something, in 6 months, that oil may be gone.

Cosmoline has some wax in it, that does not evaporate
http://en.wikipedia.org/wiki/Cosmoline
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