How To Make a Silicone Block Mold of an Irregularly Shaped Model


You can save material and money by making your silicone mold conform to the shape of your model.  In this video, Milo shows how to use aluminum flashing to create a custom mold box for an irregularly shaped model.

The model is created by carving modeling board using a CNC router.  Epsilon™ epoxy coating is used to give some areas of the model a shiny finish.  A mold box which curves to follow the contours of the model is made using aluminum flashing and wooden buttresses.

Mold Max™ 30 tin cured silicone is mixed and poured over the model.  After the rubber cures and the model is demolded, Featherlite™ resin is poured into the mold.  The Featherlite™ resin is lightweight and easy to paint.

Materials Used in this Tutorial

  • Tooling Board
  • CNC Router
  • Glue Gun and Glue Sticks
  • Aluminum Flashing
  • Wooden Paint Sticks
  • Epsilon™ Epoxy
  • Mold Max™ 30 Silicone Rubber
  • Vacuum Chamber and Pump
  • Mixing Sticks and Buckets
  • Isopropyl Alcohol
  • Cast Magic™ Pig Iron Powder
  • Featherlite™ Liquid Plastic
  • So-Strong™ Colorant
  • Acrylic Paints