Description of problem:
Excess paint applied on a vertical or inclined surface does not hold and runs along side the panel.
Causes:
- Spray gun too close to panel.
- Spray pass is too slow.
- Wrong spray gun setup (nozzle too wide or air cup too small).
- Low air pressure.
- Incorrect viscosity.
- Bad application conditions (it is too cold or air circulation is lacking).
- Not enough flash off times between coats.
- Thinner too slow or too much retarder is used.
- Hardener is too slow.
- Paint is sprayed over dirty or oily surface.
- Temperature of paint is too low.
Preventive measures:
- Use correct hardener and thinner.
- Ensure that spray gun is in good working order.
- Warm object and material up to room temperature.
- Use correct air pressure.
- Avoid thick coats and observe flash off times.
- Allow some time before turning up the temperature in the spraybooth.
Remedy:
- Sand and polish.
- Sand and repaint.
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