If you look at the ASE website, Freeze 12 is just a 134a blend!
If you are concerned about having to have a licsence to purchase R12, just go to the ASE website and take the test to become certified. Takes about 30 minutes to take this open book test, and a $15 charge.
Jeff
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1971 R600 Mack toterhome (SuperDawg)
99 NU-WA Snowbird 34+2 SE 102 5er
If it's not diesel, it's not in my stable!
53 F100 617.951/auto
95 Dodge 3500 Cummins/5 speed service truck