I guess if I had a R12 system I would be looking at the Freeze 12 . Which I believe is compatible and the way I read works better than R134.

I don't think there are any legal hassles with Freeze12
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Why should I retrofit an R-12 system with Freeze 12 instead of R-134a?
1. Freeze 12 will cool better than R- 13 4a in most retrofit applications.
2. Freeze has a pressure curve which is close to R-12 while R-134a operates at significantly higher pressures than R- 12.
3. Freeze 12 works with the existing mineral oil and does not require lubricant replacement as R-134a does.
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Why should I buy Freeze 12 instead of one of the other alternatives?
1. Freeze 12 will be competitively priced compared to the competition.
2. Freeze 12 has been thoroughly tested and shown to be an effective replacement for R- 12.
3. Freeze 12 is expected to have excellent distribution nationwide to insure that it is available for the consumers car wherever they may need service.
4. TCC has been in the refrigerant business for over 30 years with the expertise
and knowledge to provide this product to the marketplace.
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Can I use Freeze 12 in non-automotive applications?
Because of the license agreement on this patented product, TCC can only sell it for automotive use. TCC is Technical Chemical Co. and is the manufacturer of Johnsen Products/Freeze 12.
Smokie