Term: blistering

In painting, "blistering" refers to the formation of bubbles or raised areas (blisters) on the painted surface. This defect occurs when moisture, heat, or air becomes trapped beneath the paint film, causing it to lift away from the underlying surface or previous coat.

Common Causes of Blistering:

• Painting on a damp or wet surface
• Applying paint in direct sunlight or on a hot surface
• Poor surface preparation (e.g., dirt, grease, or moisture)
• Using incompatible paint systems
• Moisture migrating through walls (especially in exterior applications)

Prevention Tips:

• Ensure surfaces are clean, dry, and properly primed.
• Avoid painting in extreme heat or direct sunlight.
• Use high-quality, breathable paints suited to the substrate.
• Address any underlying moisture issues before painting.

Blistering not only affects the appearance of the finish but can also lead to premature paint failure if not properly addressed.