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Last updated: August 12, 2019

What Does Peeling Mean?

Peeling refers to the formation of uneven or rough irregularities in the surface of a coating film applied on a metallic surface. It often occurs when a binder fails to flow uniformly across an object's surface.

Peeling of a binding material or coating over the surface of a metal may lead to undercutting in which progressive rusting or corrosion of the material under the coating occurs because the material is exposed at the place where the coating has peeled.

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Corrosionpedia Explains Peeling

Peeling can cause coating failure, structural damage and damage to the appearance of a metal structure or product. Causes of coating peeling include:

  • Incorrect coating gun adjustment and techniques.
  • Extreme shop temperature.
  • Improper drying.
  • Improper flash or recoat time between coats.
  • Wrong thinner or reducer.
  • Too little thinner or reducer.
  • Materials not uniformly mixed.
  • Substrate not sanded thoroughly.
  • Uneven surface of the material.

Peeling of the surface coat, primer or paint can be substantially reduced by proper surface preparation prior to the application of the coating and the use of a coating material with strong adhesion characteristics through the use of an inhibitive primer on the substrate prior to application of a top coat.


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