> What about some of the automotive leak stuff? From bars-leak to liquid
> glass?
Actually, there are _boiler_ stop-leak products that are probably better
suited to the application (maybe pretty similar, I dunno...). If it's some
isolated, small damage, or perhaps a leak in a solder joint that may have
been poorly made 40 years ago, stop-leak may be a good alternative.
However, if the pipe or solder joints are corroded enough to leak, it's
quite possibly a widespread problem just beginning to show itself, and a
very short-term fix at best. Even one badly corroded area is not a good
prospect for stop-leak. It's best for little pinholes in fairly solid
material. Pour and hope, but be prepared to see a recurrence even if it
does fix it for right now.
If this is hydronic, at least you probably don't have too much pressure to
deal with.
Karl
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