i used alumilite amazing clear cast resin which takes about 24hrs before it cures but the benefit is that if there are any small air bubbles they have plenty of time to come to the surface so no degassing is required.
This resin is a dream to turn not at all brittle and i turned it with a square carbide tip.
When i get a pressure pot i will switch to the fast cure resin which is ready to demould in less than an hour