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Solvent Entrapment

Last updated: September 12, 2019

What Does Solvent Entrapment Mean?

Solvent entrapment refers to a type of paint defect that occurs on substrate surfaces being treated against corrosion. Solvent entrapment is caused when the applied paint coating does not fully dry due to poor drying conditions or the application of a subsequent coat too soon. The paint's corrosion protection may be compromised if solvent entrapment occurs.


Corrosionpedia Explains Solvent Entrapment

Solvent entrapment is primarily identified by the presence of blisters or pinholes on the metal's surface after application. These can be identified as follows:

  • Blistering is the presence of bubbles just below the paint surface. It may feel like sandpaper to the touch when dry and is often caused by improper surface cleaning prior to paint application or high humidity.
  • Pinholes are small, deep holes that expose the substrate surface that often occur due to improper paint application and allow for sections, pockets or minute areas to be missed by the coating. Poor atomization and pigment settling is also a cause of this defect. Pinholes can be rectified by brushing out the existing pinholes and applying an additional coat.

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