How to make moulded plastic parts at home

Written by alex smith | 13/05/2017
How to make moulded plastic parts at home
Turn recycled plastic and resin pellets into useful parts with moulds. (Karens Photography/iStock/Getty Images)

In the past anyone who wanted custom plastic parts had no choice but to go to a large manufacturer and pay an equally large fee. But today materials are readily available to produce plastic parts from your own home for a relatively small financial outlay. These parts are as high-quality as those created in a large factory, but offer the ease and comfort of working when and how you want to.

Make plastic moulds

Use hot glue to attach the object to be moulded to a flat working surface.

Cut the bottom off of a disposable plastic container and place it over the object. If the object is an unusual size or shape, use a strip of cardboard instead. There should be at least 1.25 cm (1/2 inch) of room between the object and the walls of the container.

Glue the container to the working surface to make sure none of the silicone leaks out.

Spray the object with two coats of acrylic enamel.

Mix the silicone in a mixing cup according to its directions.

Pour the silicone slowly into the container at the lowest point and allow it to cover the object. If you pour the silicone from high above the container any small air bubbles will break as it drizzles down. Fill the container to 1.25 cm (1/2 inch) above the highest point of the object.

Allow the silicone to cure.

Create plastic parts

Remove the plastic container or cardboard and clean the mould of any residue left by the object.

Brush or spray a liberal coat of mould release into the mould and allow it to dry.

Mix the liquid plastic in a mixing cup according to its directions.

Pour the mixed liquid plastic into the mould at the lowest point. Allow it to fill the mould.

Remove the plastic part from the mould once it has hardened and make as many more as you need.


Mix liquid plastics in a well ventilated area to reduce the danger of fumes.

Things you need

  • Silicone moulding compound
  • Cardboard or disposable container
  • Hot glue
  • Scissors
  • Aerosol acrylic enamel
  • Liquid plastic compound
  • Release agent
  • Brush
  • Rubber gloves
  • Disposable mixing cups
  • Mixing sticks

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