In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
I used a bottle of this once to stop a leak at a threaded connection on a new install. Actually, it was new copper going into an existing cast-iron tap. Anyway, it stopped the leak cold and I never had any more problem with it.
Somebody told me once that it's a good idea to pour a bottle of stop-leak into new installations, just in case. Is that true? Do you run the risk that it will gum up valves and flat plate heat exchangers, or some other system component? Would stop-leak be an acceptible way to stop a leak in a soldered joint, or just a sloppy plumbing & heating practice?