Steve, system was evacuated prior to recharge - guess I could have had R-12 put back in for big $ , or R134a or one of the new butane mixes!. A sticker explaining the new refridgerant was placed over the orig. A/C label. Tom, I bought the Freeze 12 at my local NAPA auto parts store. I believe their web site might list distributors and also has alot of info and FAQ