Moon Sand is a product that repels water, therefore it stays dry all the time.  My task in the investigation to find out how Moon Sand repels water, or what elements make this possible.  Moon Sand when in the water is more like dough, the sand sticks together, but out of the water it is normal sand.  I have found out what Moon Sand isn't made out of wheat, eggs, milk, gluten, casein, and peanuts.

http://www.moonplaysand.com/