As mentioned, I visited SweComposite for research purposes a while back. They focus primarily on carbon fibre parts for motorcycles but also do marine work as well has healthcare jobs. Kenneth Holmberg, pictured below, was very helpful and gave lots of friendly advice as well as sold me some of the items I was missing. I just wish I had asked him about what to use as release lubricant for the mould…
I wouldn’t be surprised if I contact him for advice soon.
The materials used to make guitars pre 1970 were of a higher quality, for example Brazilian Rosewood which was often used, can no longer be legally imported into the US. And 30 years ago guitars were more of a hand made item, whereas today most guitar manufacturing is done through computer controlled routers and cutters.