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How to Fix and Prevent Paint Sagging

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Example of paint sagging

                         Normal vs. sagging paint
            (Photo courtesy of The Paint Quality Institute)

Sagging is a downward "drooping" movement of the paint that occurs immediately after application.

Paint that sags leaves a runny, filmy, drippy appearance on the surface. A paint sagging problem can be avoided if you are mindful of these factors:

What Causes Paint Sagging?

  • Applying paint too thickly
  • Applying paint in cold or humid weather
  • Paint that is over-thinned
  • Airless spray painting with the wrong tip or the gun held too close to the surface

How to Avoid Paint Sagging

  • Sand glossy surfaces before application
  • If you notice thick patches of paint while it is still wet, brush or roll it out to distribute it evenly
  • If the sagging paint has dried, sand the surface and repaint
  • Do not thin the paint
  • Avoid applying paint in cool or humid conditions
  • Two coats of paint at the recommended spread rate are better than one heavy coat
  • If you plan on painting doors, consider removing them so you can paint horizontally

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