Blistering happens when the paint coating loses its adhesion and lifts up from the surface. So it looks like a swollen film. This usually occurs with high-quality paint or high-density paint.

Causes 

• If it happens at the top, it may be because the upper edge of the wall is not painted or its slope is not well adjusted.
• Water pipes in the wall leak.
• The walls are cracked.
• The painted surface has high moisture.

Solution

• Adjust the slope or level the floor.
• It is better to fix the cause of water leakage first, such as repairing cracks, filling putty, or making a waterproofing layer on the surface.
• Scrub off and clean the old paint with water and a plastic brush.
• Apply Nippon Paint Ultra Block Sealer, which is a high moisture resistant primer, 1 coat.
• Apply Nippon Paint Weatherbond 2 coats as a top coat.
• Low paint adhesion. The coating peels off or can be peeled off.

Causes 

• The surface before coating has dirt, dust, or grease stains.
• The wall or painted surface has high moisture.
• The surface is glossy such as precast cement, Roman columns, or cast concrete slabs.
• Primer was not applied to the surface before painting.
• Use of poor-quality putty such as gypsum.

Solution

• Scrub off and clean the old paint with water and a plastic brush.
• Apply Nippon Paint Excel Primer 1 coat.
• Apply the outer coating 2 coats:
  • Interior: Nippon Paint AirCare
  • Exterior: Nippon Paint Weatherbond