At first, I had some reservations about this project… A glass jar filled with water coated in clay? I thought the jar would leak. And it probably would, if you didn’t seal it with hot glue. As long as you make sure your jar is dry, the hot glue really does make a good seal. It is amazing! Model Magic is also an easy way to coat the outside of the jar. It was cool to see what people made with their model magic.