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Last updated: August 3, 2018

What Does Staining Mean?

Staining refers to the occurrence of a paint defect that is due to the discoloration of an applied coating on a substrate. Such paints are applied to metal surfaces as protection against corrosion.


Corrosionpedia Explains Staining

Staining occurs when a solid or fluid comes in contact with the coated metal surface and leaves a noticeable impression or residue. It is often due to structural designs containing several corners and crevices where moisture and debris may be captured.

Staining can be prevented by the following methods:

  • Use of structural designs that reduce moisture capture
  • Use of dark colored coatings or paint that hide signs of impurities
  • Chemical washing the affected surfaces as a preventative approach

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