Lifting of the paint film from the underlying surface, which appears as bubbles or blisters in the paint, usually cased by heat, moisture or a combination of both. This condition can eventually lead to peeling of the paint if not corrected.
- Painting in direct sunlight or on a surface that is too hot.
- Application of an oil-based or alkyd paint over a damp, wet surface.
- Exposing a fresh paint film to dew, high-humidity or rain.
- Moisture passing through interior walls from common household sources such as bathrooms, kitchens and laundry rooms.
- Determine if blisters were caused by heat or moisture. Break open and examine the substrate and back side of the blistered pain.
- If only the newest coat of paint is blistered, the blistering was probably caused by heat.
- If the peeling blister contains several coats of paint and the bare surface is exposed, the blister was probably caused by moisture.
SOLUTION FOR HEAT-INDUCED BLISTERING
- Remove the blisters by scraping, sanding or pressure-washing down to underlying coats of paint or prmer.
- Repaint the surface with a high-quality interior/exterior paint ( make sure the surface temperature is below 90 degrees F.
SOLUTION FOR MOISTURE-INDUCED BLISTERING
- Repair loose caulking and improve ventilation of the building to prevent a recurring problem.
- Remove the blisters by scraping or sanding down to the bare surface.
- Prime all bare areas with a high-quality primer.
- Repaint the surface with a high-quality paint in the desired finish.
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