Downward "drooping" movement of the paint film.


(Excessive flow, causing runs or sagging in paint film during application. Ussually caused by applying to heavy a coat of paint or thinning the paint too much). Downward "drooping" movement of the paint film, patterns in paint film which resemble curtains.

Possible causes

  • Application of a heavy coat of paint.
  • Application over hard or glossy finish.
  • Application in excessively humid and/or cool conditions.
  • Application of over-thinned paint.
  • Airless spraying with the gun too close to the substrate.
  • Application over residual film.


  • Glossy surface should be sanded before painting. If the paint is still wet, immediately brush out or re-roll to redistribute the excess evenly. If the paint has dried, sand, and reapply a new coat of top quality paint. Do not thin the paint; avoid cool or humid conditions. Paint should be applied at its recommended spread rate. Two coats of paint at the recommended spread rate are better than one heavy coat.