The process of painting can be divided into three steps:
a) Pre-painting work
b) Surface preparation
- Check surface for incidence of dampness or water seepage.
- Rectify the water seepage problem at source. This could mean repairing leaking pipes or cracks in the exterior walls.
- Any loose plaster should be removed from the wall. Check for loose plaster by tapping on the walls. A hollow sound indicates loose plaster.
- Masonry work is to be undertaken to fill up all cracks and repair broken plaster
- Please ensure proper curing time (7 to 21 days depending on extent of plastering). When re-plastering is done it should be given proper drying and stabilising time to bridge the cracks or smoothen the surface.
- Allow newly plastered surfaces to mature for a period of at least 6 months after the application of a coat of lime ash to ensure thorough drying of plaster. Popping of plaster, commonly associated with new Neeru plasters, can be taken care of subsequently during painting.
- Remove loose particles and paint flakes. Scrape with sandpaper to ensure that the surface is dry and free from dust, dirt or grease.
- Previous coatings of lime wash or powder distemper or cement paint must be thoroughly scraped off. Earlier coatings of oil or synthetic emulsion paints, if in good condition, need not be removed. However, the gloss or sheen of such coating must be removed by thorough sanding.
- Cracked or flaked paint must also be completely removed.
- Fungus affected areas need to be given a separate treatment. Make a 5-10% solution of bleach powder in water and apply on affected areas with brush or sponge. Wash the walls with clean water after an interval of 8-10 hours. Allow the surface to dry sufficiently.
- Apply a coat of wall primer. Use Decoprime Wall Primer (solvent thinnable) on absorbent surfaces and use Decoprime Wall Primer (water thinnable) on new surfaces.
- Fill and level the minor undulations of wall by applying putty. For best results, use Asian Paints Acrylic Wall Putty. In case of major undulations on the wall surface, POP (Plaster of Paris) work needs to be carried out. Ensure that the surface is uniformly smooth by sanding after POP or putty work.
- One liberal coat of Decoprime Wall Primer (solvent thinned or water thinned) is recommended on puttied areas before the application of top coat. The primer should be allowed to dry for 10 – 12 hours. If the primer coat is not applied over the puttied areas, there can be a patchy appearance of the top coat.
- Avoid application of putty or filling compound while painting exterior surfaces. Fill up cracks with a 1:3 (by volume) cement and sand mixture.
- All external drainage pipes must be checked for rusting or leakage. Any faulty plumbing must be rectified
- Special attention must be given to the roof. Check for cracks near the edges and close to the water reservoirs. Proper masonry or waterproofing work on the ceiling will enhance the performance of the paint.
For exterior surfaces it is very important to undertake repairs of any wall imperfections before commencing painting. The most common problem with exterior walls, especially old constructions, is cracks in the wall. Avoid applying putty or filling compound while painting exterior surfaces. Fill up cracks with a 1:3 cement and sand mixture. All external drainage pipes must be checked for rusting or leakage. Any faulty plumbing must be rectified.
Special attention must be given to the roof. Check for cracks near the edges and close to the water reservoirs. Proper masonry or waterproofing work on the ceiling will enhance the performance of the painted surfaces.
- Newly plastered surfaces must be allowed to cure for at least 35 to 45 days before painting.
- To ensure long protection, the surface to be painted should be free from dust, grease and any loose materials.
- Remove any fungus and algae growth thoroughly by brushing it vigorously with wire brush and then cleaning it with bleaching powder solution in water (dissolve 10% bleaching powder in 1 litre of water, filter the solution and apply with a brush or sponge). This treatment should be done with greater care on the top of the awnings, sunshades, parapets and other horizontal surfaces where water is likely to accumulate during monsoon.
- Previously oil painted surfaces should be sanded thoroughly to remove loose particles and made dull and matte for better adhesion. Exterior rough surfaces, previously coated with cement paint, should be wire brushed and washed with water thoroughly and dried completely. Before painting, ensure that the surface is free from chalking.
- The exterior surface should not be affected by water and constant dampness should be avoided. If you are painting during the rains, allow for 2-3 days of total sunshine for the surface to dry out completely and before commencing painting.
- Apply a liberal coat of Asian Paints Exterior Wall Primer using recommended method.
- Apply two coats of top coat paint at recommended dilution. You can use Apex Weatherproof Exterior Emulsion or Apex Textured Exterior Emulsion or Ace Exterior Emulsion as top coat.
- A gap of 4 to 6 hours must be given between two coats.
- It is recommended that horizontal surfaces like the tops of awnings and parapets must be given an additional coat for greater protection.