Author: haroonkhan

Distemper comprises a base, a binder, a thinner and a pigment. Whitening or chalk forms the base, glue forms the binder, water forms the carrier or thinner and a colouring pigment. Distempers are available in a powder form or a paste form. They are to be mixed with hot water before use. This is more…

Distempers are water paints consisting of whitening (i.e., powdered chalk), glue or casein as a binder and suitable colouring pigments. Distempers are used on plastered, cement concrete and on various wallboard surfaces. They are cheap, durable and are pleasing in appearance. They also safeguard the surfaces from adverse weather conditions.

Based on the solvent used, varnishes may be classified as given below: 1. Oil Varnishes Oil varnishes are prepared from the hardest resin or gums, such as amba, copal, etc., by heating and dissolving them in linseed oil with turpentine. Heat is added to increase the workability. Although it dries slowly, it is the hardest…

The properties of an ideal varnish are as follows:

The three ingredients of a varnish are: resins or resinous substances, solvents and driers. 1. Resins As stated earlier, the commonly used resins are copal, lac or shellac and resin. Copal is available from the earth at places where pine trees existed in the past. It is a hard substance in a variety of forms.…

In general, varnish is applied on wooden surfaces of doors, windows, etc. to decorate the surface without hiding the beautiful grains of wood and at the same time to protect the surface from atmospheric effects. Sometimes painted surfaces are also varnished to enhance the appearance of the paint and also to increase the durability of…

Varnish is a clear, pale solution of a resinous substance dissolved in either oil, turpentine or alcohol. The resinous substances are amber, common resin, copal, lac or shellac. The solution spread on the surface after drying forms a hard, transparent and glossy film on the varnished surface.

Various types of paints are discussed below: 1. Oil Paint The various constituents of an oil paint are discussed in Section 12.2.4. These paints are self-priming and in general do not need any special primer or undercoat. When it is used for general decoration purposes, it is a common practice to apply at least three…

An ideal paint should possess the following qualities:

Metals and wooden surfaces are generally painted by oil paints. Sometimes walls are also painted by oil paints. Thus, it is worth discussing the constituents of an oil paint. An oil paint is made up of six main constituents, viz., base, inert filler, colouring pigment, vehicle, thinner and drier. 1. Base The base forms the…