Development of ridges and furrows in a paint film when the paint dries.

rough, crinkled surface caused by drying interference and forming a wrinkled skin. Usually caused by: applying paint too thickly; painting over insufficiently cured primer; or painting during extreme hot or cool/damp conditions.

(1) An upward, "tenting" displacement of a roof membrane, frequently occurring over insulation joints, deck joints and base sheet edges; (2) Membrane defect characterized by upward displacement of the membrane, usually over insulation board joints. See RIDGING.

coating defect consisting of the formation of small ridges or folds in the coating which resemble the surface of a prune, but are usually smaller in size.

Paint defect that causes paint to become wrinkles when it is not desired. The application of paint over an incompatible primer, in direct sunlight, when temperature is not optimum, over a glossy surface, etc. can cause this problem.