Can of air duster for a/c recharge

Searching for one thing and i stumbled upon this interesting video



Not that i condone this idea...

I have heard of this before, and though I have never done it, I am pretty sure that it really does work for Refrigerant-12 systems.
 
It's was the first time for me was looking at the MSDS sheet for crc freeze off and saw what was being used as propellent... Same as can of air duster
 
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