Paint gives us a feeling of newness and sense of competeness to our house. Colours bring joy to life. We paint our walls, our furniture etc. basically for decoration and protection. We use paint because it makes our surroundings more attractive, live and vibrant. Paint adds colour to our lives. 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 defects like sagging, blooming, flaking, wrinkling, etc. are observed in painting, either during painting or sometimes after the painting. These defects arises either due to chemical attacks, effects of atmosphere, sunlight, heat, humidity and dust all either individually or jointly deteriorating it. Among them, blistering is the most common defect that is observed on painted surfaces.
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Blistering or bubbling as the name suggests is a blister on the surface which has been painted. It occurs as the paint film gets lifted from the underlying surface and air bubble is created in that tiny lifted space. It is basically the loss of adhesion between the paint film and surface which is usually caused by heat, moisture or a combination of both. This defect gives an ugly look to your house and mars the beauty of painted surface. One therefore needs to take all precautions to avoid this type of defect.
Precautions to Prevent Blistering on Painted Surface:
- Make sure that the surface to be painted is clean and dry.
- Apply primer-sealer over any stains and let it dry completely.
- Allow the paint to dry completely before exposing the surface to moisture.
- Follow the specified recoating time intervals between successive coats of both primer and paint.
- Avoid painting in direct sunlight especially in hot summer months and also avoid painting when it looks like raining,i.e. when humidity is very high.
- Consider installing vents or exhaust fans in humid areas.
- Use appropriate solvent and apply appropriate film thickness.
Tips for Fixing or Repairing Blistering:
- If the blisters or bubbles go down to the underlying surface, first try to remove the source of moisture. Remove blisters by scraping, then sanding the surface. Allow sufficient drying time after cleaning.
- If the blisters do not go all the way down to the underlying surface, remove them by scraping and sanding. Once the problem area has a smooth finish, coat with primer before applying a good quality acrylic latex interior paint.
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- To avoid blistering, acrylic paints should be applied at specified spreading rates and be allowed to dry before dew or rain strikes.
- To prevent blistering problem, make sure that the underlying surface is completely dry before painting. Use heat resistant paints for areas that have extreme heat. Select light colours as they reflect more heat.
- Ascertain that the paint adheres effectively to the surface. Remove all defective paint. Let each coat fully harden before further application of paint.
- Prime any bare timber with a high quality water based primer, and repaint with high quality water based exterior paint.
Remember mere taking curative action is not going to solve the problem. If blistering is happening due to moisture you will have to stop and take all preventive steps to stop moisture. Any half hearted measures without going to the roots of the problem and addressing preventive measures are not going to be useful.
Hence apply the paint carefully after reading all manufacturers’ instruction. Understand properly the causes of blistering, take required precautions. Your painted surface will have a defect free life.