How to make sand stick together like cement?

my friend says the mail box house is made of sand and they made it very solid dry
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you can do it with water and salt & of course sand here instructions how to https://www.instructables.com/id/Solidifying-Sand/ maybe they bought/used this SAKRETE PermaSand is a joint locking material used in place of regular sand to stabilize pavers, stone or blocks. Made from a mixture of sand and special additives, it is designed to harden with moisture. or use resin/epoxy or glue(indoor)
Here you go Ronald!
https://www.bing.com/videos/search?q=hometalk%3a++how+to+make+sand+stick+together+like+cement%3f&qpvt=hometalk%3a++how+to+make+sand+stick+together+like+cement%3f&FORM=VDRE
Hello Ronald,
I should think PVA Glue?