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I'm not the first folks, people have been using this for years with great success. R-12 refrigerant is difficult to come across for a fair price, and then you'll have to find it on craigslist or from some old timers stash. You can convert it over to R-134a, however it's not going to.cool nearly as well and will downright suck at traffic lights. This is safe and it works! It's actually R-152a or HFC-152a. This is what's inside the duster cans.