Description of problem:
The gloss of a refinish is evaluated according to the sharpness of the reflected image. A smooth surface reflects like a mirror. Any loss of gloss is generally due to the formation of irregularities in the paint film which lead to the scattering of the reflected light and that means a loss of sharpness in the image formed at the surface.
Causes:
- See section on cracking.
- See section on moisture blisters.
- High film thickness.
- Too much air humidity during application.
- Solvent sensitive substrate.
- Incorrect mixing ratio or contaminated hardener.
- Use of unsuitable thinner.
- Insufficient airflow in the spray booth.
- Interrupted baking.
Preventive measures:
- Follow application recommendation.
- Close hardener cans firmly after use.
- Ensure sufficient airflow in the spray booth.
- Do not interrupt baking cycle.
Remedy:
- Sand and polish.
- Sand and repaint.
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