EasySeal Refrigerant Leak Sealant ??
 

Seems too good to be true...

Nu-Calgon: Products: Total System Protection


YouTube - A/C EasySeal Refrigerant Leak Sealant

http://www.nucalgon.com/assets/prodlit/3-52_3-119.pdf

http://www.nucalgon.com/assets/prodlit/3-249_ES.pdf

http://www.nucalgon.com/assets/prodlit/3-951.pdf

At first I was concerned that the product might "bind up" in orifices, but the literature suggests that this only happens if there are contaminates in the system.
This product kinda' reminds me of anaerobic sealant; stays as a gel until it is absent from air.
Follow the procedure in the literature and all should be OK.