Post #489307 by Unkl Ian on Tue, Oct 20, 2009 9:21 PM

A two piece mold is most common, but complex shapes may require
several pieces, to allow you to be able to get the part out of the mold.

Another trick, you might be able to hand work the pieces
after they come out of the mold, to add subtle details.

Plaster molds degrade with use, their detail becomes worn down,
parting lines more noticeable, etc, and they need to be replaced.