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Paint gives us a feeling of newness and sense of completeness in our house. We paint our walls, our furniture, etc. basically for decoration and protection. It makes our surroundings more attractive, live and vibrant. However, the deterioration of the paint earlier to its rated life is considered as a failure of the paint. The failures have many reasons and there are various defects.
Several defect like cracking, patchiness, blistering, etc. are observed in painting, either during painting or sometimes after the painting. These defects arise due to either chemical attacks, effects of atmosphere, sunlight, heat, humidity and dust or individually or jointly deteriorating it. Among them, chalking is the most common defect.
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As the name suggest ‘chalking’ is a formation of a white, chalky powder on the surface of the paint film during weathering, which can cause colour fading. Over the time, almost all the paint will have this defect if subjected to outdoor exposure. It mainly occurs due to insufficient oil in primer. We have already discussed causes of chalking in our recent article.
Precautions to Prevent Chalking on Painted Surface:
- Ensure proper surface preparation.
- The surface must be properly cleaned.
- Always refer information sheets and comply strictly applying technique mentioned therein.
- Mix the paint properly while colouring pigment is added.
- Use weather resistant paint for areas exposed to weather or UV light.
- Make sure that the paint is not contaminated with foreign materials.
- Remove any unstable paint films.
- Don’t use an interior paint for an outdoor application.
Tips for Fixing or Repairing Chalking:
01. Determine the degree of chalking by rubbing the surface with a finger or dark cloth.
02. Remove all chalk residues by one of these methods:
- Remove chalk by washing or power washing the surface with an appropriate cleaner. If a proper cleaner is not available, rub the surface with a stiff brush and detergent. Thoroughly wash with high pressure of water.
- Light to moderately chalked surfaces may require wire brushing or sanding to remove the excess surface powder. Then wash the surface with high pressure of water.
- Allow the surface to dry thoroughly.
03. Check the surface again using your finger or a cloth to determine the amount of chalk residue;
- If little or no chalk remains and the old paints are in good condition, priming is not necessary.
- If light to moderate chalk remains, use a powerful additives to the first coat of water based paint, so that the paint film bonds to the chalked surface.
04. If noticeable chalk still remains, use oil or alkyd based masonry primer as the first coat of paint. Finish using a high-quality topcoat.