i don’t know what kind of fabric this is, but the yellow bolt i bought at the thrift shop (that we’ve used for all sorts of things), repels water!
one day we used the fabric as a table cloth. when water spilt, we noticed it didn’t soak in.
very quickly water droplets were being blown across the table (and more water was poured on)!
really cool stuff.
newcreationpreschool.com 
What a wonderful discovery! I’ll bet all kinds of experimenting could happen with that fabric.
AWESOME!!!! You could have them try to cut the drops with a toothpick….its tough!
:)