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Rich,
I have seen reports that when the stone gets on the thinner side it can develop cracks and then break.
I am not sure if this is a result of improper drying or it is the stone itself. I...

A possibly cheaper way to glue the stone to a base is to get cedar wood cut it to size and use gorilla glue. I have done this to my 5k super stone and many Jnats, and it works like a charm.

they can break if they are without base, if they are on a base you are safe.