3D Design: plaster casting
I can experiment with three plaster casting methods and show how form, surface and construction interact.
- Year 10
3D Design: plaster casting
I can experiment with three plaster casting methods and show how form, surface and construction interact.
Lesson details
Key learning points
- When casting, plaster is poured directly over a model to create a mould.
- When casting, the model is coated with a release agent to prevent sticking.
- A mould can be created in two halves, allowing for more complex shapes.
- Applying a thin layer of plaster (poured or brushed) to a model and building up several layers creates a solid shell.
Keywords
Mould - a hollow form used to shape plaster
Release agent - prevents plaster sticking to the model
Casting - pouring a liquid material (like plaster) into a mould, where it hardens into the shape of the mould to form a replica
Common misconception
I can just pour all the plaster at once and it will work.
Plaster heats as it sets and pouring too much at once can trap air, cause cracks or damage the model. Layering ensures detail and structure.
Equipment
Plaster of Paris, containers, clay, brushes, petroleum jelly, objects for moulds, PPE (gloves/masks), aprons, mixing tools, sketchbooks and pencils.
Licence
Lesson video
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