Fill the balloon with water . This image illustrates why you don't completely fill the balloon you should always leave some room in the neck of the balloon, then as the form dries the pressure has somewhere to go and your clay wont split like that.
"Mrs. Fiona Snark," I said, not looking up from the paper. "Miss, it's just Miss." Her sickly lemon voice sounded. I looked up, "Oh, can't imagine why." She gave a discourteous nod and breath and walked by, the length of her cape not so accidentally.