Process Of Varnishing
Application of varnish on wood work is carried out in the following steps
- Preparation of surface: The wood surface is made smooth by thoroughly rubbing it by means of sand paper or pumice stone.
- Knotting: The process of knotting is carried out exactly in the same way as adopted for painting wood work.
- Stopping: Stopping is done by means of hot weak glue size so that pores on the surface are filled up. Alternately, boiled linseed oil can be applied in two coats. The dry surface then be rubbed down with sand paper.
- Coat of varnish: On the cleaned surface, two or more coats of varnish are applied. Next coat is applied only when the previous coat has dried up thoroughly.
The desirable characteristics of an ideal varnish are:
- It should give glossy surface.
- Should be durable.
- It should dry rapidly after application.
- It should not develop cracks after drying.
- It is commonly used on wooden surfaces.
- Colour of varnish should not fade away with time.
- It should not hide the natural grain of inner surface of timber.
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