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Painting Guide
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Metal Painting Process :
Metal surfaces exposed of variations in temperature and moisture tend to rust and wear out with time. It is strongly advised to paint the surfaces to protect and prolong the life of the surface. It is essential that the paint system must completely isolate air and water contact to the metal surface.
General Preparation :
  • Thoroughly inspect to identify areas of rusts, damage, stains etc to be taken care of in the painting process.
    Cover the floor with newspapers or plastic near the surface to be painted to avoid unnecessary splatter on floors and walls.
    Ensure that the metal surface is clean and dry.
    The painting should be executed in a place that is well ventilated.
    Prepare a trash can lined with plastic bag to throw the wastes.
Surface Preparation :
It is strongly recommended that metal surfaces should not be painted without proper surface preparation. Paint does not stay on galvanized steel, tin or aluminium if the surface is not adequately cleaned and prepared.

During the surface preparation exercise it is recommended that you wear safety goggles and a mask to avoid being exposed to unnecessary dust. Sand paper, Sanding Block, Cloth, little water and a stiff brush should be kept handy for the exercise.

Remove traces of oil and grease by cleaning with mineral spirits.
Any rust should be completely removed with Rust Remover paint, because paint does not adhere well on rusted surfaces.
If required use a Paste Filler to correct dents and surface imperfections.
Rough up the surface with coarse grade sandpaper or a wire brush. Wipe down with a damp cloth or sponge to remove all traces of dust. Sanding will also help adhesion of the paint.
Primer Coat :
Primer coat plays a very important role on metal surfaces because metals are usually not friendly to paint coat and it is difficult for the paint to hold on to the metal surface. Coating the clean bare metal with primer enhances the holding ability of the surface. Some primers have rust inhibitive properties and are useful to prolong the life of the product. Primers are also essential when we are painting a light colour over a dark colour or vice versa. They help give uniform colour and texture to the finished paint, and provide better adhesion to the top coats.

Depending on the type of metal being painted, a suitable primer must be selected.

Generally 1-2 coats are required. Take care to apply primer on a clean and dry surface and allow the coat to dry before application of the next coat. For smoother finish sanding can be done with emery paper no. 320 before applying successive coat.

Finish Coat :
Generally two coats of finish coat are required to get the desired finish and colour. It is also important that each coat must be completely dry before the application of next one. Please refer to the instructions with the paint purchased for finding out drying time and special properties if any.

  • Thinner can be used as per the requirements of the job. Also if two coats are applied, sanding with emery paper grade 400 is advisable before application of second coat.

 
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