Why do I see blisters in the paint film

Dome shaped projections or blisters in the dry paint film through local loss of adhesion from the underlying surface. Blisters may contain liquid, gas or crystals.

What are the possible causes?

• Localised loss of adhesion due to contamination with oil, trapped moisture, rust or salt.
• Wet sanding operations (particularly with polyester based products) without sufficient time to allow water to evaporate before application of top-coats.
• Blisters can occur in many sizes, patterns and frequency and can form between individual layers or beneath the entire film build.

How can I fix the problem?

• Thoroughly clean the areas to be painted with clean water.
• Consider changing to dry sand operations to avoid water absorption when sanding.
• Allow sufficient time for water to evaporate when wet sanding happening