Casting with plaster was proving a disappointment. The eggs worked well in practice but haven’t excited me. I wondered what would happen if I cast into a bag more loosely, and also onto a piece of fabric which would be embedded in the casting material. I also wondered about using Sculptamold as a casting material rather than a moulding material.
A piece of hessian was placed in a plastic bag and a slightly liquid mixture of Sculptamold was poured onto it. The bag was hung in a tree to allow gravity to settle the casting material, and also to help dry the mixture in the sunshine. Hessian was used because it is a neutral colour, has an interesting texture, and if it didn’t stick to the cast it would at least leave an interesting pattern.
The partially set casting was put in a low oven to finish curing. The result was both light in weight and quite intriguing. The hessian appears almost as a natural skin to the Sculptamold, it seems to cradle the molding material.
So, casting straight onto a textile works. Although I haven’t fully cast the internal shape of my vessel (the plastic bag), I have cast the lower curve of the bag. Next steps if time: experiment with casting onto different fabrics.