FWIW, Water Glass is sold as glue for Fiberfrax at Aircraft Spruce.
Tommy<><

David;  Do you know any real old mechanics. The ole timers here always used
a product called water glass, available from the Drug Store.  I wouldn't
want to put in more than a 1/2 teaspoon in the coolant to start with, as
this stuff can be really nasty if you get to much in.  I have seen it seal 6
inch cracks in iron blocks.  One fellow I worked with dumped a pint in his
old ford tractor, ( a little is good, a lot is better theory) needless to
say he had to replace the water pump, as it set up.  JohnD

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