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Painting adds colour and life to the house and therefore it is very important irrespective of size of the house. For efficient planning and execution of painting work on calcareous surfaces such as concrete, masonry and plaster one should know how to paint them correctly to get a long-lasting finish. Painting new calcareous surfaces are likely to cause alkali attack on paint. Here we give you some important tips which are very helpful while painting new calcareous surfaces.
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01. Never start the painting works until the new surfaces have properly set, cured and all excess moisture has dried out from it. Painting before full drying of the calcareous surface can cause peeling of paint, giving you endless problems. Hence don’t start soon.Ideally allow one year to pass for drying.
02. Select the paint system which does not seal the moisture. Oil based paints generally seals moisture. Therefore, for initial painting choose the paint system in due relation to the ultimate scheme for repainting. For example, if you intend eventually to paint the surface with solvent based paint, the initial paint might be done with material which can be removed easily and completely, or with one which is suitable to receive solvent based paint.
03. Sometime it is not possible to allow the required time for the surface to dry out fully. In such cases apply lime wash, colour wash, cement paint, oil-free distemper or suitable emulsion paint. These all type of paintsallow drying to continue at a reasonable rate through their films. Never use glossy or oil based paints until drying is complete.
04. If a surface remains continuously damp, first examine the cause and then treat the surface with suitable treatment before the paint. If sometimes remedy is impractical, then affected surface can be treated by battening out and plastering or boarding.
05. If efflorescence appears on the wall, it can be treated by plastering or with metal foil to prevent the absorption of water from the exterior or the penetration of water into the interior.
06. Painting partition walls on both the sides may increase the risk of paint failure, because the means of escape of water introduced during construction operations are restricted. A difference in the porosity of the paint films applied to either side of a wall may result in one side being more affected than the other. The risk is similar and greater when only one side is painted and another side is sealed by some impermeable form of treatment. For example, wall tiling. Particularly, severe conditions may be met when walls, partitions and ceilings are built of materials that need large quantities of water for curing and setting.
07. If you paint with a glossy finish on the new surface, the surface should be even and straight because imperfections will beclearly visible on glossy finish.
08. If plaster work is not done properly, it is liable to develop surface crazing. If this defect is present treat it accordingly before painting to prevent the cracks or appearance of cracks in the finished work.