Chalking is the formation of fine powder on the surface of the paint film during weathering, which can cause colour fading. Although some degree of chalking is a normal, and is the expected way for a paint film to wear, excessive film erosion can result in heavy chalking which is never a good look.

Possible Cause

Generally there are some contributing factors that cause chalking;

  • Paint not applied at recommended spreading rate
  • the use of low-grade, highly pigmented paint or,
  • use of an interior paint for an outdoor application.

 

Solution

To eliminate the effect completely, the entire surface will need to be pressure washed and/or scrubbed with a non-metallic scouring pad to remove all surface contaminants and chalking prior to repainting.

 

Prevention

The use of a water based 100% acrylic latex topcoat provide superior exterior durability and gloss retention relative to many alternative coatings systems, especially oil based enamels. A number of Dulux® decorative paint products could be considered but for maximum gloss and colour retention, the Dulux Weathershield range provides the best performance.


More problem solving advice

Mould

If you’ve noticed black, grey or brown areas on your painted surface, chances are you’re dealing with a mould problem.  For each problem you’ll find a guide to identifying it, its causes and solutions.

Cracking / flaking

Cracking or flaking is the splitting of a dry paint film. This is a problem that needs fixing as it can lead to complete failure of the paint. For each problem you’ll find a guide to identifying it, its causes and solutions.