I was intrigued by this process some time ago, when I read an article on artist Evelyn Rosenberg. Found a book in the campus library on the technique that outlined how it was used to make large low-run forms like fuel-tank ends for rockets.Tooling was a fraction of that it would take to make a steel die, as it could be made out of epoxy-coated concrete. (And the process can be used to make objects that would be impossible due to their size and the capacity of existing presses.) The interior is filled with water (Incompressible) to make the transfer of the shock safe® and more efficient. There were some great examples of how a seamless tube was formed into a complex shape by placing it between the mold halves with a strand of primacord strung end-to-end.
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