- Solvent/air trapped in paint film, which then escapes leaving small bubble like marks. The most common cause is excessively high film build due to:
- Too many or too heavy coats.
- The hardener or thinner is too fast drying.
- Incorrect spray gun nozzle.
- Incorrect material viscosity (too thick)
- Incorrect spraying pressure (too low).
- Incorrect flash off times.
- Drying oven has insufficient airflow.
- Curing temperature too high.
- Apply a normal film thickness by using the correct spraying viscosity, spraying pressure and spray gun nozzle.
- Use a slower drying hardener and thinner.
- Use the correct and recommended flash off times.
- Check oven temperatures regularly.
- In minor cases:
- Sand with P2000 – P4000 grit wet or dry, then try to polish out using a recommended cutting compound.
- Once dry, sand with P1000 – P2000 grit sandpaper and re-paint.
- In severe cases:
- Prime affected areas with primer surfacer, allow to dry then sand and re-spray with topcoat.
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