One of the best refrigerants out there is propane but as you all know it is very flammable. So stay away from anything that has propane in it under the hood of a car. I have asked about buying 134a around here and never been told that I need a license. I was told many years ago by a manager at Pep Boys that I had to have a MAC license to buy R-12 from them. I am licensed in the HVACR industry by RSES but they (or he) wouldn't recognize that licensing network which is very sad because at the time, they had a warehouse full of 12 that was cheaper than what I was selling it for at a refigeration wholesale house! I hear they still have a lot of it.

Later!
Mr. Ed

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1971 Torino 500 hardtop, 302, Cruise-O-Matic.