I am trying to cast small helical gears from a gearbox we use.  I am using the Easy Composites Starter kit.  Frst timer

I have tried using FAST CAST Polyurethane Casting Resin, with mixed results, though still testing.  My question is, the originals appear to be a form of nylon.  Is there different materials available to cast with other than FAST CAST, that have properties that are closer to nylon.  Also is there other materials that are easier to pour or are closer to water.

Best Regards

Carltonm