3D Design: plaster casting
Lesson details
Learning outcome
I can experiment with three plaster casting methods and show how form, surface and construction interact.
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.
Teacher tip
Have clearly labelled example stations for each technique. Use small, manageable forms for faster drying. Demonstrate the proper mixing ratio of plaster to water and health and safety, including wearing face masks and gloves.
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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Prior knowledge starter quiz
6 Questions
Q1.What is plaster casting?
Q2.True or false? Plaster must never be washed down the sink because it hardens and can block the pipes.
Q3.What is the role of a release agent in plaster casting?
Q4.Which of the following are three types of plaster casting methods?
Q5.Why might an artist use a two-part mould?
Q6.When mixing plaster, what should you do to avoid air bubbles?
To help you plan your 10 art and design lesson on: 3D Design: plaster casting, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 10 art and design lesson on: 3D Design: plaster casting, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 4 art and design lessons from the 3D Design unit, dive into the full secondary art and design curriculum, or learn more about lesson planning.