Alright guys, visit www.autofrost.com if you're looking for technical information on your air conditioning options. The inventor, George Goble first posted his stuff back in the early '90s in rec.autos.tech. (remember usenet?) Back then it was called GHG-12, for R-12 replacement. He's also developed R134a replacements. I would think this kind of info should be in the shop talk area too.