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Runs

Also known as: overloading, curtains, gun spits, sags, sagging, drips

 

Description
Heavy application of sprayed material that fails to adhere uniformly to the surface.

 

 

Origin and Potential Causes:
  • Incorrect spray viscosity, flash off time, technique, or film thickness.
  • Defective spray gun or incorrect gun setup.
  • Wrong thinner or reducer.
  • Too much thinner or reducer.
  • Lighting in the spraybooth is not accurate and the painter is unable to apply coating correctly.
  • Surface is contaminated by oil, grease, etc.
  • Shop, surface or paint is too cold.
  • Low air pressure (causing lack of atomization), holding gun too close, or making too slow a gun pass.
  • Incorrect technique of application.
  • Paint drops from the gun.

 

Prevention Techniques:
  • Allow vehicle surface to warm up to at least room temperature before attempting to refinish.
  • Try to maintain an appropriate shop temperature for paint areas.
  • Use proper gun adjustment, techniques, and air pressure.
  • Don't pile on finishes. Allow sufficient flash off and drying time in between coats.
  • Select proper thinner/reducer.
  • Read and carefully follow label or product data sheet instructions.
  • Select the thinner and reducer that is suitable for existing shop conditions.
  • Install accurate lighting systems in the spray booth.
  • Ensure that the spray gun is in good working order.

 

Remedy
Wash off the affected area and let dry until you can sand the affected area to a smooth surface and refinish. For solid colors and clearcoats, sanding and polishing is recommended. In the case of a basecoat, refinishing after sanding is necessary.

 
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