Chalking

 

 

Description

A chalky dusting or powdering at the paint surface, often associated with old, weathered paint film.

 

Cause

Precipitation of elements within the paint. This may be due to:

  1. Incompatible or defective materials within the paint.
  2. Degradation of the binding agent.
  3. Degradation of pigment.

 

Prevention

  1. Use recommended materials.
  2. Avoid exposure to ultraviolet light (strong sunlight) and harsh shampoos.

 

Rectification

Flat, compound and polish the surface to restore the gloss. In severe cases repaint the topcoat.