Interior decoration is incomplete without painted walls. Proper wall decoration will surely enhance the beauty and look of your house. Deterioration of the paint earlier to its rated life is considered as a failure of the paint.
Several defects like wrinkling, blistering, flaking, etc. are observed in painting, either during painting or sometimes after the painting. These defects arise due to either effects of atmosphere, sunlight, heat, humidity and dust or individually or jointly deteriorating it. Among them, efflorescence is one of the most common defects observed.
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Efflorescence is the white (powdery) substance on the substrate of concrete, brick, masonry and plaster surface. It is not only of aesthetic concern as it can ruin, the appearance but can also physically damage paint coatings. The efflorescence, which is due to the migration of salts, can lift the paint film from the substrate. We have already discussed causes of efflorescence in our recent article.
Precautions to Prevent Efflorescence on Painted Surface:
- Remove all powdery substances and thoroughly clean the surface.
- Ensure that the surface is moisture free, clean and suitable for paint application.
- Give a long time gap between plastering and painting.
- Ensure joints and cavities are properly sealed.
Tips for Fixing or Repairing Efflorescence:
- If the efflorescence is caused due to the excessive moisture, eliminate the source by repairing the roof, cleaning out gutters and downspouts, and filling any cracks in the masonry with a good quality sealant.
- If moisture is coming from the walls from the outside, apply a waterproofing coating to the outside to surface.
- Apply a suitable sealer and coating system which are formulated for concrete, masonry, etc.
- Remove the efflorescence and all other loose material with a wire brush, power brush or power washer; then thoroughly rinse the surface. Apply a quality water-based or solvent-based masonry sealer or primer, and allow it to dry completely. Then apply a coat of top quality exterior house paint or masonry paint.
- Use paint with a porous film like emulsions and distempers.
Hence apply the paint carefully after reading all manufacturers’ instructions. Understand properly the causes of efflorescence, take required precautions. Your painted surface will have a defect free life.