Surface Treatments & Finishes For Natural & Manufactured Timbers (AQA GCSE Design & Technology): Revision Note
Exam code: 8552
Painting
Painting coats timber with pigmented finish
The surface is sanded, cleaned and often primed before several thin coats are applied
Adds colour and protects the surface, but hides much of the natural grain
Worked Example
State one reason for applying painting to a product.
[1 mark]
Answer
Adds colour and protects the surface, but hides much of the natural grain. [1]
Varnishing
Varnish forms a clear or tinted protective film over timber
Timber is sanded, dust is removed and thin coats are brushed or sprayed, with light sanding between coats
Shows the grain while improving resistance to moisture, dirt and wear
Worked Example
State one reason for applying varnishing to a product.
[1 mark]
Answer
Shows the grain while improving resistance to moisture, dirt and wear. [1]
Examiner Tips and Tricks
Questions on finishes are often 6 mark 'describe' questions. In these you will be expected to describe all the stages leading up to the finish including sanding. Remember that a bigger grit number means a finer abrasive paper, not a coarser one. This fact is commonly reversed by students, so double-check it in any answer that describes sanding stages for painting or varnishing timber.
Tanalising
Tanalising pressure-treats timber with preservative chemicals
Timber is placed in a sealed vessel; air is removed and preservative is forced deep into the fibres under pressure
Improves resistance to rot, fungi and insects, making timber suitable for outdoor use
Worked Example
State one reason for applying tanalising to a product.
[1 mark]
Answer
Improves resistance to rot, fungi and insects, making timber suitable for outdoor use. [1]
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