For plaster of paris, we use two parts plaster to one part water. We’ll just do it that way. Let’s just regular plastic. Regular plaster paris. You can get at a home Depo or a hardware store or a craft store. Two parts class, or one day. Part water, two parts plaster, one part water. By volume. Get it in the mold before it sets up too much.
Learn more about the course here:
https://www.curiousmondo.com/basic-bottle-glass-fusing-course