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.
Regards et Maisons- My home and DIY. CONCRETE GLASS
The prototype. (bird). Could diy with fast drying concrete
DIY Concrete Garden Projects • Ideas & Tutorials!
Easy way to tie a perfect bow. Always great tips from The Organised Housewife!