I'm new to resin casting and have already had some fun casting with silicone molds. My issue is the silicone is so expensive, especially in Australia I'm paying about $70 a kg.
I have a pretty ambitious project that requires 14+ molds but I calculated the minimum volume and it comes out to 8kg of silicone or $560!
I was wondering if I could substitute the majority of the volume with plaster of paris?
Example I would paint on the silicone which would be 2-5mm thick capturing the detail and then cover the rest in plaster of paris. Please let me know if anyone has tried this and if it is possible?