Paint Finish Problems - Metallic Mottling
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Metallic particles in the base coat are dispersed unevenly, partially changing the color’s appearance. | |
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Metallic particles are moved to irregular arrangement during clearcoat application. | |
CAUSES:
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Improper painting conditions (paint reducer/thinner type, paint volume, air pressure, discharge volume, use of spray gun) and painting technique (spray pattern). | |
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Paint reducer/thinner evaporation rate extremely slow. | |
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Clearcoat excessively diluted with paint reducer/thinner. | |
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Insufficient drying time between application of metallic color coat and clearcoat. | |
PREVENTION:
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Paint under the optimum conditions. | |
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Inspect and clean the spray gun. | |
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Properly dilute clearcoat with the paint reducer/thinner. | |
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Allow sufficient drying time before clearcoat application. | |
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Apply clearcoat in several thin coats. | |
CORRECTIVE ACTIONS:
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If the clearcoat has not been applied, take enough setting time to and repeat the metallic color coat application steps to remove unevenness. | |
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If the clear coat had already been applied, dry the surface completely. Then sand and repaint. | | | |