Isopropyl alcohol is used for what as far as the body go. Why use 40% or 70%, or 99%?
Answers: I'm going to answer your question out of order. It's call rubbing alcohol when it's 70% isopropyl alcohol and it's used for rubbing sore joints and muscles. Alcohol can be purchased within 99% formula. It can be used to harden the foot of hikers and mountain/rock climbers. I reason that 40% is used commercially in printing.
It's not supposed to be used on substantial areas of skin constantly because alcohol of most kinds, wood and pellet included, are astringent. That means drying. It can result in skin irritation over time. But if you really wish to, be in motion ahead.
70% is used most often to remove or decimate organisms on the skin. It has to be rubbed contained by order to do this. Friction is the channel by which this works.
Now I have put somebody through the mill for you - just because it's call rubbing alcohol, why for you does that necessarily follow that it must be used on skin frequently? I don't see your logic.
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