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What is the brown stain that sometimes appears on roofs freshly coated with waterborne acrylic roof coatings immediately after heavy dew?

April 26, 2017acrylic appears Brown Coated coatings freshly roof roofs stain waterborne

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What is the brown stain that sometimes appears on roofs freshly coated with waterborne acrylic roof coatings immediately after heavy dew?

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This is an exudate that contains water-soluble components from the roof coating. These materials easily wash off and should be removed if additional coating is to be applied. Not removing these will interfere with intercoat adhesion.