Blistering is the formation of blisters resulting from the swelling of the paint.
Blisters may be empty or filled with water. Under the blisters, the film paint does not adhere to the surface anymore causing paint lifting.
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Causes
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1. Excessive humidity in the surface medium, especially wood.
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2. Rust on metal.
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3. Efflorescent salt accumulation on masonry.
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4. Already painted surface repaired with a joint compound and painted with a water-based paint.
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5. Paint applied at overly high temperatures.
Solutions
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1. Prepare the surface properly and repaint. Use blistering-resistant paint. Depending on use, it is preferable to apply a water-based paint if possible. Water-based paints let the film breathe and offer better adherence to masonry.
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2. Prepare the surface properly and repaint. Choose a paint especially designed for metal.
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3. Prepare the surface properly and repaint. Use blistering-resistant paint. Depending on use, it is preferable to apply a water-based paint if possible. Water-based paints let the film breathe and offer better adherence to masonry.
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4. Prepare the surface properly, apply a solvent-based base coat on the joint compound and repaint.
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5. Prepare the surface properly and repaint.
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It is preferable to use a filling compound for repairing surfaces already painted.
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Check surface temperature. It must match room temperature. Optimal application temperature ranges between 15 °C and 25 °C (60 °F and 77 °F). Outdoors, avoid painting if the wood moisture content exceeds 12 % (Latex stains, 18 %).
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Only paint dry materials and prevent water infiltration.
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