Paint Blistering: Causes, Prevention, and Repairs
A fresh coat of paint adds to the attractiveness, liveliness, and vibrancy of your living space, which is why a significant amount of time and money goes into painting. Unfortunately, the newly applied paint might start to develop blisters and bubbles. The causes for this unsightly blistering depend heavily upon the quality of paint and surface preparation.
Let’s unveil some of the most common sources of blistering paints.
Causes of Paint Blistering
Moisture is one of the most damaging things to a paint job, which is triggered by the water-retaining quality of concrete. Being porous in nature, concrete allows water to seep into it or flow through it. When concrete dries and hardens, it lets out a considerable amount of water. A new coat of paint serves as a barrier to the exuding moisture. The failure of moisture to find an outlet causes blisters and bubbles to appear in fresh paint.
As discussed in the beginning, the quality of paint contributes to paint blistering. Traditional paints and primers are useless for something as porous as concrete. They tend to hinder the outflow of moisture, thus resulting in blisters and bubbles. Therefore, it is important to use concrete-specific paints to avoid blistering. Such paint products develop numerous microscopic holes that allow moisture to flow through.
Poor Surface Preparation
Surface preparation is a crucial component of the painting process. Inadequate preparation of the surface prevents the paint from adhering to the surface. For the paint to cling perfectly to the surface, the surface needs to be striated. Furthermore, covering the previous coat of paint with a fresh one also causes blistering.
Lastly, efflorescence is also a major contributor to the problem of blistering paint. Efflorescence is the white layer of salt and water that exudes from concrete and appears on top of the surface. Applying fresh paint to an efflorescent surface gives birth to blistering, with a white powdery surface oozing from the blistery pockets.
How to Prevent Paint Blistering?
Here are some easy ways to prevent the paint from blistering.
Before painting, the surface needs to be prepared and dried.
Discourage any exposure to moisture until the paint has dried.
Cover the stains, if any, with a primer-sealer and allow it to dry.
Try to avoid painting directly in the sunlight or when the weather is too humid.
Depending on your chosen finish, apply the appropriate solvent and the right film thickness.
How to Repair the Blistering Defect?
- Try to remove the source of moisture. Thoroughly sand or scrap the surface and allow it to dry.
- With the surface scraped, sanded, and dried, apply a high-quality primer before covering the surface with a new coat of paint.
- Acrylic paint must be applied at the spreading rate prescribed by the manufacturer.
- Allow each coat to fully adhere and stick to the surface. Let each coat dry before covering it up with the next coat.
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