1. mechanical plan

    Mold Release Options

    So I'm halfway through a two part plaster mold. I've never made a two part before and I was going to use spray silicone as a release between layers. Starting to second guess myself now. Any advice on the if that will work? Probably something I should have tested or considered before this stage...
  2. helix_3

    Benefits of Hydrocal over portland cement + sand?

    Hydrocal is significantly more expensive than portland cement, and harder to source. Does hydrocal have any additional benefits outside of high strength and fast set time?