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Paint Finish Problems - Chalking (Whitening)
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Moisture in the air is concentrated in the paint film making the surface whitish, dulling the desired gloss.
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CAUSES:
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Using fast evaporating paint reducer/thinner during high temperature and humidity ambient conditions. | |
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Spray gun air pressure too high. | |
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Extremely cold paint surface. | |
PREVENTION:
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Use high quality reducer/thinner with the correct evaporation rate (addition of an evaporation retarder can also help). | |
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Properly set the spray gun’s air pressure. | |
CORRECTIVE ACTIONS:
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If the symptom is not severe, add the retarder to the diluted paint and repaint. Or polish the paint surface with compound. | |
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If the symptom is severe, sand down the paint surface after drying it thoroughly. Then repaint. | | | | 
