Value Wall Guard

These bubble-like appearances are caused by blistering, which happens when certain areas lose adhesion, forcing the paint film to lift from the surface.

What are the possible causes?

• Painting under direct sunlight or on surfaces that are too warm. This is especially true if the coating you’re using is dark in colour and solvent-based.
• Applying an oil-based finish on a wet or moist surface
• High humidity or conditions where moisture seeps out of exterior walls. This is less likely to occur if you’re using a water-based paint as it allows water vapour to evaporate without reacting on the paint film.
• Exposing water-based finishes to dew, high humidity or rain immediately after the paint has dried. This becomes a greater issue if the surface has not been properly prepared at first, or if the quality of paint is poor.

How can I fix the problem?

• Start by checking if the blisters go all the way down to the substrate. If they do, it may be due to moisture from within.
• Remove sources of moisture. Repair loose caulk and install vents and exhaust fans wherever possible.
• Scrape and sand blisters till they go away. Prime any exposed wood and repaint.
• If the blisters are on the surface only, the problem is likely to be caused by painting on a warm surface or under direct sunlight. It could also be because the painted surface was exposed to moisture soon after painting. Do scrape and sand away the blisters in this case also
• Prime exposed wood and paint the wall with a high quality water-based exterior paint