Has anyone had any experience with Red-Angel A/C Stop-leak?

http://store.gobluedevil.com/a-c-stop-leak-49496

 

My 2002 Forester has a minor leak somewhere in the A/C system, and I cannot locate it.

On a fresh charge, the A/C works OK. But the system pressure gradually diminishes, until after about 24-h, the pressure is so low that the A/C clutch will no longer engage.

 

The slow-leak started a year ago, after I took the engine out to replace the clutch; that required me to pull the A/C compressor out of the way over the side fender; and that caused the A/C hoses to bend sharply. But I've soaped all of the A/C components, and I cannot find the leak. And I've replaced the 2 banjo-bolt O-rings on the compressor itself.

 

I'm looking at the Red-Angel additive, because it is compatible with R12 refrigerant, to which I have already converted.

 

Any recommendations, or otherwise?

Check the lower corners of the condenser.its common for the bottom corners to corrode and start leaking. Avoid Stop leak in the AC system at all costs.

maybe charge with UV dye mixed refrigerant? be sure to check the schrader/charge valves.

you're sure the two orings aren't leaking, very common.  you used A/C orings and an appropriate size?

i'd replace:

schrader valves

hoses (rarely fail and easy to replace so used is reasonable fit sometimes)

maybe charge with UV dye mixed refrigerant? be sure to check the schrader/charge valves.

+1 on using UV dye that you can self install from the small cans. Since you are loosing that much refrigerant, that is really a major leak. The dye works well to pin point a leak.

 

Don't recommend using any kind of additive to try to seal a leak. I did that once, only to plug up the condenser, so the system did not work at all.