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That sounds like industrial grade hot glue--it would have a greyish color to it.

I can't say for sure on that one Dave-- both Zinc Oxide and Calcium Carbonate are white powders and the Waterglass binder--Sodium Silicate is a thick clear liquid similar to corn syrup. So where the...

Dragline--welcome to PyroTalk.
You can buy a bag of Kitty Litter at the "Dollar Store" or WalMart--look on the back to see that is says it is "bentonite" [clay]. You can run this thru a rocket mill...