Also known as: poor flow, poor levelling, pebbling
Description
Uneven surface formation - much like that of the skin of an orange - which results from poor coalescence of atomized paint droplets. Paint droplets dry before they can flow out and level smoothly together.
Origin and Potential Causes:
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Improper gun adjustment and techniques. Too little air pressure, wide fan patterns or spraying at excessive gun distances causes droplets to become too dry during their travel time to the work surface and they remain as formed by gun nozzle.
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Extreme shop temperature. When air temperature is too high, droplets lose more solvent and dry out before they can flow and level properly.
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Improper dry. Gun fanning before paint droplets have a chance to flow together will cause orange peel.
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Improper flash or recoat time between coats. If first coats of enamel are allowed to become too dry, solvent in the paint droplets of following coats will be absorbed into the first coat before proper flow is achieved.
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Wrong thinner or reducer. Under-diluted paint or paint thinned with fast evaporating thinners or reducers causes the atomized droplets to become too dry before reaching the surface. Too high viscosity.
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Low shop temperature.
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Too little thinner or reducer.
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Materials not uniformly mixed. Many finishes are formulated with components that aid coalescence. If these are not properly mixed, orange peel will result.
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Substrate not sanded thoroughly
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