Powdery/Chalky Surfaces Possible Causes Over thinned paint applied on the surface Highly porous and absorbent surface making film under bound. Paint film deteriorating due to action of sunlight , oxygen or salt in air in marine areas   Premature rusting or cracking of paint on metal surfaces Possible Causes Too thin application Improper undercoat application Incorrect primer usage   Flaking of paint film Possible Causes Substrate not dry -moisture beneath the paint film. Painting over rust results in little or no adhesion Painting on an inadequately prepared surface.   Dampness Possible Causes Broken or defective plumbing or some other general building defect. Paint should not be applied until the source of dampness is addressed.   Efflorescence /Blistering in walls Possible Causes Moisture beneath the paint film can cause crystallisation of salt from building material such as bricks. Paint should not be applied until the efflorescence has ceased to appear and has been removed.   Algae/Fungus Growth on Painted Surfaces Possible Causes Algal/Fungal growths are most likely to occur in damp conditions or on surfaces with a high moisture content. Algae growth on exterior masonry can be a problem in sheltered environments that are in close proximity to trees and bushes.   Brush Marks Possible Causes Too thick application - paint not thinned as per recommendation. Application done on very rough surface or highly absorbing surface Poor brush condition Poor painter skill   Fading Possible Causes Use of interior paint for exterior applications Direct prolonged exposure of an interior surface to sunlight Use of inappropriate colorants for creating shades
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