The formation of a powder on the surface of a weathered coating. The powders usually consist of broken down binder and freed pigment particles due to UV, temperature and moisture exposure.Chalking is usually identified by rubbing the surface with a damp cloth which results in a light deposit on the cloth and the restoration of the colour to the cleaned surface.
Possible Causes
Using interior quality paint for outdoors use.
Using a low grade paint comprising of a low binder and high pigment loading
How Can I Fix This Problem
Remove the friable chalk by scrubbing with stiff nylon brush and rinse with water. High pressure equipment can also be used. Check for any remaining chalk after the surface had thoroughly dried. Repeat the cleaning process if powder is still present.
If chalk persists, recoat with alkali resistant primer/bonding liquid and recoat with appropriate quality top coat.
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5 Year Warranty (T&C Apply)
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