The building units other than wood, aluminium and iron, other structurally finished surfaces are given a final finish to improve the appearance by using white/colour washing or distempering.
Pure lime or fat lime is slaked first and the required quantity of water is added to make the solution. The solution should have a milky consistency and in order to make the solution stick to the surface glue and salt are added.
The surface is first prepared by making good the nail holes and other surface defects. Then the surface is cleaned by rubbing with a hard brush. The water is sprinkled on the surface before application of the first coat of white wash. The first coat is applied by moving the brush from upper to lower and the second coat is applied by moving the brush from lower to upper after the drying of first coat. Generally three coats are applied on new surfaces.
The colour wash solution is prepared with adding a suitable pigment powder or liquid concentrate and 5% of gum. The colour wash application is similar to that of white wash. One or two coats of colour wash is given over the first white wash.
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