How are you going to cut a mold in fiberglass? I make boat molds and other fiberglass tooling and have never seen it done this way. Normally you make a master "Plug" and treat it with one or two of many release agents and lay up the gel coat and fiberglass mold on it. The mold is opened and the master removed.
I am also a home shop machinist. I bought a milling machine from a shop that used it to mill fiberglass ijected plastic parts. I got worse fiberglass itch in my hands every time I used the mill than I ever did cutting, grinding or laying up boats or boat molds. Once I completely degreased the mill and re lubed it it cured this problem.
Good luck with your project.
JIM |