Blistering

What it means

Blisters are raised areas in a coating film. Investigation should consider moisture, trapped material, substrate condition, heat and application conditions.

What to check

Surface preparation and cleanliness
Compatibility of previous and new coating
Application method and film build
Drying/curing conditions
Manufacturer instructions and technical data

For a product-specific diagnosis, identify the exact product and surface and consult the current manufacturer guidance.