The design and construction of items which will be connected to the mains supply where the use of electricity is peripheral or fundamental (eg, low-voltage power supplies for electronics).Instruction in the repair and maintenance of equipment.The construction of electronics circuits from prepared modules or components.

A polyester resin, dissolved in styrene, is hardened by mixing with a catalyst. The resin is often used with glass-fibre reinforcement to give glass-reinforced plastic (GRP). Small scale repair kits use similar materials but with the catalyst supplied as a paste.

Adhesives mainly used to hold textiles together temporarily or to affect a repair. Other compliant materials are often held together by glues of many different types.

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