The reason I am bringing this up is that recently I ran across a product (which I will not name for the moment), I am not trying to promote them). This company makes customized stop leak material that works on most everything automotive including open drive car AC systems, all common refrigerants No downsides. 96% + success rate I learned that chemistry has come a long way. Think about it. Who believed in 1960 that there was a genuine product on the market which could truly and permantly plug a leaking head gasket in a car ? Here is my point: I think geo manufacturers and the heat exchange coil makers need to spend a few more dollars either perfecting or testing possible leak sealers on the market. Just because some past ones did not get along well with compressors doesn't mean the challenges cannot be solved. If you do not want to test new units, at least test the stuff on used ones. The product I just mentioned can seal a head gasket in one hour of running. I was told the chemistry detects pressure difference and the product seals at the pressure difference without reacting negatively with anything else: antifreeze, water, etc. If this can be done for cars and if the product I am describing can hold up to combustion pressures, I just don't believe that we are that far away from refrigerant / or water side leak sealers that can search out a leak and plug it. There is one other way to look at it. Test the stuff first, but imagine the selling point !