New here as a ceramic arts daily member, but i have been browsing this forum for great info for years!
I am currently trying to make an outdoor sculpture for a project I am working on in architecture school. I am thinking about using Hydrocal® White Gypsum Cement to create my sculpture because of its durable qualities and hopefully easy to finish nature (please feel free to advise me if I am right or wrong on these, I am new to working with the material).
The question I have involves casting the Hydrocal to create the sculpture. I am thinking about creating a hollow clay coil mold for my sculpture, into which i would pour the hydrocal mix to allow for it to conform to the coil mold's interior shape and form. I would pour-cast this sculpture as the clay mold (laguna bmix) would be in the leather-hard shape. To limit the weight of the final sculpture, I would want to let the outer portion set up and be able to pour a significant amount out, so the final hydrocal sculpture itself is hollow too.
Does this sound like it would work? I am worried that the hydrocal would stick to the clay mold, or that it would be too thick a consistency to pour out to make it hollow.
I hope that this makes sense to you all. Please respond with whatever feedback you think that i need, with whatever information you could offer me. I appreciate all the help!