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Question
The detachment of the paint film from the surface is known as _____
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A.
Chalking
B.
Cracking
C.
Flaking
D.
Wrinkling
Answer ( Option C)

Flaking

Solution

The defects commonly found in paint work are following:
• Flaking: It is detachment of some portion of paint film from the surface due to poor adhesion between paint and the surface to be painted.
• Chalking: The formation of a white, chalking powder on the surface is known as chalking. It occurs due to insufficient oil in primer.
• Cracking: It is formation of cracks on the painted surface due to inadequate surface preparation and shrinkage.
• Wrinkling: This type of defect is more prominent when a thick layer of paint is applied on a horizontal surface.
• Blistering: Formation of bubbles like shapes on the painted surface is known as blistering. It occurs when water vapour gets trapped under the paint layer.
• Blooming: Formation of dull patches on the painted surface is known as blooming. The primary cause of this defect is poor quality of paint and proper ventilation.
• Fading: When there is gradual loss of colour from the painted surface, it is known as fading. The cause of this defect is the reaction of sunlight on pigment of paint.
• Grinning: If the thickness of final coat of paint becomes very thin, the background can be seen clearly. This is known as grinning. Poor workmanship is the main cause of this defect.
• Running: Tihs type of defect is seen when surface to be painted is very smooth. In case of smooth surface the paint runs back and leaves small areas of surface uncovered.

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