"Franz Heymann" wrote in message
...

That second requirement is the hard part. I am not convinced that any
glue is going to prevent the crack from propagating when the bottle is
jarred.

Isn't a traditional way of stopping cracks in glass, to drill
a small hole a short distance in front of the head of the crack?
Then fill it with glue, I suppose.

Just an idea - I have not tried it!