There are snake oil salesmen out there with a product for every need, real or imagined, but those that actually work are hard to find, and I've never heard of a "stop leak" for AC. There are leak "detectors", of course, but not sealants. Many times, the culprit is the front seal on the compressor, and since that involves a moving part, a sealant isn't likely to be effective. Dick Benjamin ----- Original Message ----- From: Philippe COURANT <accf_clb@xxxxxxxxxxxxxxxx> > Does someone know if there is a special "anti leak" or "stop > leak" product for AC system. Someone tells me yes and other tells > me no ..