so, if you want plate glass, then you're going for the big shards. If you're going for laminated glass (like most glass is nowadays), then yeah, it fragments basically into sand. Windshields are like triple-laminated glass, because the last thing they want in a car accident is giant jaggeties of glass crashing into people, which is why windshields basically break into a powder.
If you're going laminated, though, don't use salt. Any modeling material that instantly dissolves in water sounds like a bad idea to me.
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