Bianca Boya
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Professional Opinion
Chalking
The dust formed on the paint layer by weather conditions causes color fade.
Even though this is normal, over erosion of the layer may result with excess chalking.

Reasons:
-Using paint with excess filler.
-Using low quality paints.

Solutions:
First of all as much chalk as possible should be removed from the surface using hard bristle brush (or string bristle brush for stone walls).
After a well drying, to detect the chalk residue, move your hand on the surface.
If a remarkable chalk residue is not present, apply high quality primer layer followed by last layer paint.