Yes, you heat liquid plastic in microwave for 1 min, then take it out and stir, then continue in 30 minute intervals until it's liquid and clear (then you add ...more colorant, scents, flake,) @robz713
Are you buying the silicone molds or making em? I've been thinking about trying plaster for a while. Also do you just melt the plastic in the microwave?
We get silicone molds( or make your own with plaster) and you heat up liquid plastic and pour it in the molds to let dry (after adding colorant/glitter/scents) @tkotattoos