Another cool demo with hydrophobic sand is to take a tank of water and sprinkle hydrophobic sand on the water's surface. Then stick your finger in the water. It doesn't get wet! The hydrophobic sand repels the water from your finger. You can also mess around with it on a spoon, as seen in the video below, once again, of me playing with it. :-) The video shows a bubble of water coated in sand.
You can get some of your own hydrophobic sand to play with. Do a search on Amazon and you'll find plenty of purchasing options. Very cool stuff!