Also known as: featheredge splitting
Origin and Potential Causes:
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"Piling on" the undercoat in heavy and wet coats. Solvent is trapped in undercoat layers which have not had sufficient time to set up.
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Material not uniformly mixed. Because of the high pigment content of primer-surfacers, it is possible for settling to occur after it has been thinned.
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Improper thinner/reducer selection.
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Improper surface cleaning. When not properly cleaned, primer-surfacer coats may crawl or draw away from the edge because of poor wetting and adhesion.
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Improper drying. Fanning with a spray gun after the primer-surfacer is applied will result in drying the surface before solvent or air from the lower layers is released.
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Finishing grit of sandpaper too coarse.
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