Thursday, 15 October 2015

Making a Hard Plaster Mould





Here I am making a very simple mould for making corner ornament. A silicon impression from an original carved boxwood mould will be used to make a new mould. The stages are:
  • Make a fence from scrap wood
  • Fix a piece of glass to the fence with double sided tape
  • Smear the glass with petroleum jelly
  • Weigh out 560g of hard casting powder and measure 200ml of water
  • Stick the silicone impression to the glass
  • Add the plaster powder to the water and mix well
  • Pour the plaster into the fence
This will make a practical mould that can be used with compo or epoxy putty, not as crisp or refined as an original boxwood mould but a good alternative.