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I'm not a doctor or chemist, but I do play both on T.V. :D

Yes, that's exactly what happens, which causes the dryness I was eluding to above.

Typical pressurized can propellants are propane and butane/isobutane, which are extremely drying to skin. Most canned shaving creams now come with "additional moisturizers" to try to compensate for...

Sounds like you found yourself a winner.

Unfortunately, anything that contains propellant (ie- comes from a can) is bad for the skin and is off my list. Just too many other great traditional...