Does anyone know about this process used to make the guitar on the Cor77 log? Spray moulding seamless hemp?
You may be thinking of Zelfo.
I can thnk of lots of ways, from the old chopper gun to compression molding, after all what your doing is just replacing glass fiber with hemp fiber. The trick is the binder you use, polyester, ureathane, epoxie, or some thing else.