The video that you see on these lines I found most curious. I had never seen act this way a water droplet with a spray.
hydrophobic is the fear to water, and in this case from what I understood, the repellent is because the angle of a water droplet exceeds 150 grades and with this compound the surface would have an angle much less.
I wonder what would happen if you cast it in the hair...
More info: en.wikipedia.org > Superhydrophobe