Probably, for me anyway, the least glamarous part of making molds is casting my model in plaster. Last week I brought you through the process I use to make clay models of a design. While not so glamorous, casting your model in plaster is the most critical part of getting your design into production.
First up is selecting something to contain the plaster. I'm pretty simple with this.
For my dragon fly pendant, I used a ricotta cheese container. Loved the ricotta in a yummy lasagne. Loved the cost free upcycled mold form.
Problem with this mold form is that the bottom is not flat. I solve this by placing a slab of clay into the bottom of the plastic container.
Then I attach my clay model to the slab in the bottom of the mold form. What I do is make a bunch of cross cuts into the slab with a needle tool and the back of the model. Then I brush on water to make a bit of a slip on the surface of the clay slab at the bottom of my mold form. I place the model and gently tap it to get it to stick to the slab of clay. I find this useful as it keeps the model from 'floating' when I pour the plaster.