Paint is a liquid surface coating. On drying it forms a thin film (60–150) on the painted surface. Paints are classified as oil paints, water paints, cement paints, bituminous paints and special paints such as fire proof paints, luminous paints, chlorinated rubber paints (for protecting objects against acid fumes), etc. The functions of the paints are: to protect the coated surface against possible stresses mechanical or chemical; deterioration physical or environmental; decorate the structure by giving smooth and colorful finish; check penetration of water through R.C.C; check the formation of bacteria and fungus, which are unhygienic and give ugly look to the walls; check the corrosion of the metal structures; check the decay of wood work and to varnish the surface to display it to better advantage. Plastering is the process of covering rough surfaces of walls, columns, ceilings and other building components with a thin coat of mortar to form a smooth durable surface. The coating of mortar is termed as plaster. Plastering is done to achieve the following objects: