It is the process by which the surface is cleaned to take an optimum paint. In wood work knots should be avoided as there is a possibility of resinous material coming out of them. If knots are inevitable they are property smoothened by paint knoting or lime knoting application or hot read lead.
In case of iron and steel works, the surfaces are freed from rust, greeze and seals before application of primary coat.
In the case of preparing for plastered surfaces, the cracks, nail holes, etc., are first filled with a pore filling solution. After drying, this results to an impervious surface. The surface is washed with a solution of size, soft soap and water in the proportion of 2 : 1 : 18.
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