RE: A few newbie type questions
I'm probably not the authority on this poly vs. epoxy but I do know of several very large scale poly molds in use for real boats today. I have not had any twisting or shrinking problems with my hull molds - I used a good quality poly tooling resin. I reverted to a box store brand resin when making a rudder mold recently and it twisted badly...so perhaps the resin quality has a lot to do with it.