I've used many brands of glue, but you want to make sure you get glue that is water thin in viscosity. This is the fastest glue I've used, but be very careful and wear protection.https://www.amazon.com/gp/product/B00ASQ5SEE/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1 You can use the finest grain of sand, but the best is to use powder you make out of the rock you are using. Just pulverize it with a mallet, and collect it up.
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