Design and Technology (D&T) KS3: Finishing metal
This short film explains the most common and accessible ways to give metal components a polished, professional finish.
It's important to treat the surface of components made from metal to stop them changing colour and becoming damaged.
Points for discussion
- Why do metals need to be clean, dry and free from rust and oil before applying a finish?
- This film uses polyester plastic as a coating for metal. Can you think why you might use a different plastic for a different component?
- If applying spray paint as a finish, why would you build up the final paint finish in repeated thin layers?
- Why do you need to use red oxide paint on ferrous metals?
- Why would you use a primer?
- If you wanted to paint a piece of wood, would any of these skills be transferable?
- These techniques can be used on a huge range of metal-based components in KS3 projects and should be selected according to best use in KS4 RMT, product design, engineering and even graphic products projects.
- Discuss the appropriate level of finish for a garden tool project.
- Research and try oil quenching and/or tempering to provide a classy matt black finish to a steel multi tool blade.
Suitable for teaching design and technology (D&T) at KS3/KS4 in England, Wales and Northern Ireland, and 3rd/4th levels in Scotland.