Making hollow casts in open or ‘closed’ moulds – Part 1

Another fine tutorial from David on open and closed moulds.

davidneat

This post follows directly from the last one in which I featured one of the simplest ways of making a complete mould for a puppet head .. making a 2-piece block mould in silicone rubber. At the end of the post I included a couple of photos of a hollow casting using filled polyurethane resin and now I want to explain how to do this in more detail. I will also deal in later posts with making hollow casts using other materials such as Jesmonite and the advantages of being able to make a hollow cast in a ‘closed’ mould .. i.e. without having to set up a pouring hole at the mouldmaking stage.

mould with casting

Jumping forward for the moment above and below, the hollow resin cast is almost finished and just needs a little cleaning up on the seam line. Polyurethane resin normally cures a white-to-beige colour dependent on the type and this…

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