Causes:
- Use of an inappropriate thinner.
- Contamination of the surface before painting.
- High air pressure.
- Poor extraction and air flow of the spray booth that allows the dust generated by the paint itself to settle on the surface once it has begun to dry.
- The paint has dried in the presence of exhaust or industrial fumes.
- Poor drying conditions: Temperature too low, high humidity, lack of ventilation.
- Mixing ratios of hardener and thinner not according to manufacturer’s specification.
- Too many coats being applied.
- Not enough flash off time between coats.
- A highly pigmented ground coat was not stirred enough before use.
- Use of inappropriate sandpaper grade.
- Ground coat was sanded before it was fully dry.
- Hardener expired or damaged (by humidity if the can is left open).
Preventive measures:
- Use recommended thinner.
- Clean the surface well before painting.
- Use correct mixing ratios.
- Use correct pressure.
- Check air flow of the spray booth.
- Keep workshop warm in the winter.
Remedy:
- Allow the paint to fully dry and polish or respray.
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