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.
Botinhas de Natal em patchwork – Dica de artesanato fácil e rápido para a decoração da porta de entrada ou outro cantinho de sua casa ~ VillarteDesign Artesanato
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