What works best to seal or stop a leak in home airconditioning system ?
How about in line add on fluid to stop a leak like super seal or pro-tight ?
How about plug on stuff like Leak Lock ?

They make it and sell it but never put any sealer in sysytem. It's time to call in a tech and get it fixed properly. Adding that stuff in your system will cost you much more that fixing leak

DO NOT add any of this stuff, the leak/leaks need to be found and repaired by a pro.The stuff you mentioned may not work and could damage your system, so in the long run it will be much cheaper to call in a pro. When it comes to working with freon or leaks you MUST be certified by th E.P.A, if you are caught you may face BIG fines.

Forget the sealer stuff. It can really make a mess of your unit. Call and have someone find and repair the leak properly.