RQT f2w
2
have plastics as base with water as thinner. They have high covering capacity
and give a neat, decorative and pleasing appearance to the surface. Owing to their high cost
The plastic paints are mainly used for interiors of auditoriums, showrooms, modern houses
and offices. A typical composition of one litre of plastic emulsion paint is 0.20 kg of binder,
0.50 kg of pigment, 0.10 kg of other solids and 0.60 kg of water. On drying, the water
evaporates leaving behind a smooth film. One litre of plastic paint covers about 15 m^2 of wall
surface per coat.
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- Describe briefly how the following are prepared:
(a) Oil paint (b) French paint
(c) Enamel (d) Wax polish
(e) Aluminium paint (f) Cement paint - (a) What are the various ingredients of paints? State the functions of each of them.
(b) What are the characteristics of good oil paints?
(c) Why are steel structures painted? Describe the procedure of painting an old steel
structure. - (a) What is the function of adulterant in a paint?
(b) Discuss the reasons for the causes of defects in painting work.
(c) What precautions should be exercised while painting? - (a) How painting of new wood work is done?
(b) Describe in details the types of defects in painted work.
(c) What are the differences between paints, varnishes and distemper? - Name and describe the properties of:
(a) Bases (b) Driers
(c) Thinners (d) Adulterants - Write short notes on
(a) Ingredients of paints (b) Defects in painted work
(c) French polish (d) Enamels
(e) Colour wash (f) Distemper - (a) What are the ingredients of varnish?
(b) Classify different types of varnish and briefly describe them.
(c) What qualities a good varnish has? - (a) How would you judge the quality of an oil paint?
(b) What is distempering? How is it done? - (a) What is meant by spreading capacity of paint?
(b) Describe briefly how an oil paint is prepared. - (a) What are the objects of varnishing a surface? Where will you prefer a varnish to a paint?
(b) Give the requirements of paints suitable for:
(a) Wood (b) Iron (c) Cement concrete - Write shorts notes on
(a) Aluminium paint (b) Asbestos paint
(c) Bituminous paint (d) Fire proof paint
(e) Anti corrosive paint (f) Graphite paint