dima11232

10.06.2022 15:06

Английский язык

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FINISHING

Almost every woodwork job requires a finish of some kind to protect the surface from dirt, stains and moisture. Finishes seal the grain, reducing the likelihood of warping. Finishes enhance the appearance of a job by bringing out the full 'figure' (grain pattern) and colour of the wood. Every job and each wood has a finish most suitable for it.

Creosote is made of coal tar and is ideal for garden fences and similar jobs. It prevents rotting, and is cheap and easy to apply with a brush. For a teak garden seat raw linseed oil, or one of the specially formulated oils with synthetic resins, is best. In the damp steamy atmosphere of the bathroom, paint is best for cabinets and stools of softwood. Painting looks easy but each step - priming, filling, undercoating and final top coating - must be carried out with great care. Enamels give a bright and durable finish to children's toys.

A tea tray of hardwood needs a hard, heat resistant finish. Catalysed lacquers are specially made for this kind of work. The lacquer is bought in a two-part pack, lacquer and acid-based hardener. The two are mixed before use and brushed on. Usually fast drying, after rubbing down more coats can be added. Wax polish produces a fine sheen on all furniture. The wood is first sealed with a brush polish (a mixture of shellac and methylated spirits). After several coats, rubbing down between each, wax polishes are applied. Silicone waxes make the surface fairly resistant to water spills.

Varnish is oil-based and ideal for canoes and boats of marine plywood. A recently developed finish for the same type of work is polyurethane based.

Sometimes no finish is used at all for hygienic reasons. Wooden spoons, chopping boards and rolling pins of beech or teak are good examples.

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