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  Taking Care during painting
  
   

The process of painting involves a lot of dislocation. The process of scraping the walls frequently undertaken also causes a lot of dust.

Before the work of painting starts be careful to cover all electronic appliances (like TV, music systems, microwaves etc) with plastic sheets. You can also cover them with an additional layer of bubble pack for added safety.

Never leave your fragile artifacts lying around. Keep them in any room that is not being painted or request your friends or neighbours to keep them for you for a few days.

If you feel any cupboard or furniture can get damaged while shifting, ensure you are present when the painters move them.

Lastly never leave cash and other valuables lying around in the house and always ensure that there is at least one member of the house present while the painting is in progress.
   
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PAINTING PROCESS
The process of painting can be divided into three parts:

Pre-painting work
This includes preparation work like masonry work, crack filling, water proofing etc. These have to be undertaken to get the maximum life for the final paint film.

Surface preparation
This refers to the process of making the surface fit for paint application, For example if you are painting your interior walls you would need to to make them smooth by applying Plaster of Paris (POP), Putty or Lambi. Similarly for wooden surfaces you need to apply wood filler to smoothen the surface imperfections before you start to paint.

Painting
This includes the steps to be followed in getting the final paint film on the surface.



The process of painting is different for different types of surfaces. To know more about the painting process for each type of surface click on the type of surface you wish to paint.

Interior Walls

Exterior Walls

Metal surfaces

Wooden surfaces
 



Interior Walls
Pre-painting


 Check surface for incidence of dampness or water seepage.

Rectify the water seepage problem at source. This could mean repairing leaking plumbing or cracks in the exterior walls.

Any loose plaster should be removed from the wall. Check for loose plaster by tapping on the walls. Any hollow sound means the plaster is loose.

Masonry work to be undertaken to fill up all cracks and repair broken plaster.

Surface Preparation

It is advisable to 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. Rub with sandpaper to ensure that the surface is dry and free from dust, dirt or grease.

In case of repainting, previous coatings of lime wash or powder distemper 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 coatings 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. Allow the surface to dry sufficiently.

Painting


On new or absorbent surfaces apply a coat of Decoprime Wall Primer - solvent thinable.

Fill and level the minor undulations of wall by applying putty. For best results Use Acrylic Wall Putty. However for major undulations on the surface, POP work needs to be carried out. Ensure that the surface is uniformly smooth by sanding.

Wherever application of spot putty or full putty is resorted to, one liberal coat of Decoprime Wall Primer (solvent thinable) is recommended on puttied areas before the application of top coat. This measure will eliminate possible patchy appearance of top coat. Allow it to dry for 10-12 hours. Ensure that the surface is smooth and free from undulations.

For the finish coat, the chosen finish paint should be thinned with water or recommended thinner to achieve good flow and leveling properties. Keep an interval of 4-8 hours between any two coats. Generally, 2 to 3 coats of finish paint should be applied at recommended dilution for satisfactory result.
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Exterior Walls
Pre-painting

For exterior surfaces it is very important to undertake repairs of any wall imperfections before commencing painting. The most common problem with exterior walls specially 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.

Surface Preparation

Newly plastered surfaces must be allowed to cure for at least 2-3 months before painting. To ensure long protection, the surface to be painted should be free from dust, grease and any loose materials. Completely remove any fungus and algae growth by brushing it vigorously with wire brush and by cleaning it with water. 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 matt for better adhesion. Exterior rough surfaces, previously coated with cement paint, should be wire brushed and washed with water thoroughly and allowed drying. Before painting ensure that the surface is free from chalking.

The exterior surface should not be affected by any water or by constant dampness. In case of painting during the rains allow for 2-3 days of total sunshine for the surface to dry out completely and before commencing painting.

Painting

No Primer is recommended on the exterior surface.

Apply two coats of finish paint by thinning. Two coats are generally adequate for the purpose. However, for newly plastered surfaces, application of self-priming coat with 100% dilution by volume followed by two coats with 40% dilution by volume might be necessary. A gap of four hours should be given between two subsequent coats. It is recommended that the horizontal surfaces, like the tops of awnings and parapets, be given an extra third coat for greater protection.
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Metal surfaces
Pre-painting

Surface should be free from dirt, dust, grease, rust, moisture etc.

 

 

 
Surface Preparation

Degrease and derust ferrous metal substrates by suitable treatment. For nonferrous metal substrates pretreat with Apconyl-WP 636 either by brushing or spraying. If necessary, the use of Apcolite Knifing Paste Filler is recommended to fill up dents and rectify surface imperfections. Ensure that the surface is free from moisture and loose mattr. Apply Apcolite Primer Surfacer (brushing filler) by brushing or spraying. Use the recommended thinner for bringing down the consistency to the recommended level.

For best results, allow the primer coat to dry for 6 hours and dry sand with emery paper no. 180 before application of subsequent coat.

Painting

After overnight drying, apply top coat using the recommended thinner. For best results, apply two coats giving 8 hours of drying time between two coats. The first coat should be wet sanded with waterproof emery paper grade 320-400 before applying the second coat.
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Wooden Surfaces (Transparent Finishes)
Surface Preparation

For new wood surfaces first the surface has to be sanded with emery paper along the direction of the grains of the wood to remove the roughness of the wood.

This has to be followed by application of wood filler. The purpose of the filler is to fill the grains and pores and it should not be used as a putty. The excess filler must be removed by strokes along the grain pattern. After 30 minutes the filler may be applied again if required. Allow 2 to 3 hours drying time.

Sand the filled surface with emery paper no. 320.

Staining with Apcolite Wood Stains is optional.
 

Painting

For New Wood.

Ensure that the surface to be coated is free from dust. Choose any transparent coating from Karna Paints. 2-3 coats are recommended by brushing or spraying. To enhance the gloss and decorative appeal, two to three coats of finish coat application are recommended. Containers should be well capped after use.

For Pre-Polished Wood.

Sand the surface along the grains with Emery Paper No. 180 followed by No. 320 to get a smooth uniform surface. If staining is desired, completely remove the old finish. Wipe the surface free of loose dust
 
Wooden Surfaces (Opaque Finishes)

Surface Preparation

Previously painted wooden surfaces must be properly sanded to remove any dust or grease. Any surface imperfections must be removed by applying wood filler by putty knife or by muslin cloth pad in a circular motion with sufficient pressure to force the filler into the pores.

The purpose of the filler is to fill the grains and pores and it should not be used as a putty. The excess filler must be removed by strokes along the grain pattern. After 30 minutes the filler may be applied again if required. Allow 2 to 3 hours drying time before sanding and applying subsequent coats of wooden finishes.

Painting

For opaque wood one can choose conventional enamels, water based enamels or Opaque Melamine finishes.

Enamels are normally applied by brushing although they can be sprayed. The drying time of enamels is longer, hence care must be taken to ensure a dust free environment while the paint film is drying. Apcolite Silkwood is applied by spraying.

Two coats of paint is sufficient in most cases, however in case the earlier paint shade was significantly darker than the new shade an additional coat of paint is recommended.
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