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Tools, Processes and Fabrication
Quick questions on Finishing processes explained: O-Level Design and Technology
2short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are finishes for plastics?Show answer
Plastics are often self-finishing, because the colour and surface come from the moulding and the material does not corrode. Acrylic edges can be smoothed and polished to a clear shine. Finishing plastics is usually about smoothing and polishing rather than coating, though some plastics can be painted with suitable primers.
What is surface preparation?Show answer
A finish only works on a properly prepared surface. Preparation makes the finish adhere well and look smooth, even and durable; a rough, dirty, greasy or damp surface causes patchy, peeling finishes. For wood, sand smooth with progressively finer abrasive (with the grain), remove dust, and ensure it is clean and dry. For metal, remove rust and grease and prime if needed.
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