Nu-Calgon, a big name in AC products has one advertised for MVAC/HVAC use: http://www.nucalgon.com/products/tsp/a-c-easyseal

Any solid truth about damage to systems and/or tools like recovery machines other than rumors? Overheard a HVAC tech from a local large company tell my neighbor that he installed stop leak in her outdated R-22 system. I checked and there are all kinds of stop leak offered for HVAC systems including ...