Hi Arthur;
The refridgerant is made (packaged??) by Genetron, and it's in a 30 lb. tank.
I've had it a few years, but at $140 delivered, it made sense to me to buy it like that....
But it makes no mention of any leak sealants, but then again it doesn't mention anything about leak detectors either...
I would have thought it would... and should....
But the refridgerant is a distinctly bright (almost neon-like) green, so I'm pretty sure that a leak detector agent is present.....
If they aren't terribly expensive, I will check into getting a black-light...
Might as well, it's already got the leak detector at work in there....
Some place like AutoZone or O'Reilly sell blacklights??
Thanks,