Solvent Popping

Solvent popping

 

 

 

 

Cause:

• 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.

 

Prevention:

• 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.

 

Rectification:

• 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.