My car's cooling system uses R-12 as the refrigerant. I had an old can of Freon that I'd fill up with, but I just ran out. I've had a hard time finding a replacement. I'm interested in buying enough Refrigerant R-12 to last me a while (Freon or other brand). Contact me if you have any or if you know where I might find some. Thanks, much appreciated ahead of time.