So I am trying to make borax bouncy balls with the kids I nanny and it's not working. Any chemistry-clever GT-ers who can help me out?

The most recent recipe I tried is:

4T warm water

3T cornstarch

1/2t borax

1T white school glue

It just turned out wet and slimy. Making slime blobs isn't too much of a loss when you're trying to entertain little boys, but I want to make balls that really bounce!