Contents
Different Types of Defects in Painting
Following are the different types of defects in painting:
1. Fading
The effect of sun rays on the painted surface can cause some of the paint to lose its colour, this phenomenon is known as fading.
2. Bloom
Formation of dull patches on the painted surface is known as bloom. This types of defects are formed due to bad ventilation or use of defective paint.
3. Flaking
If the paint peels off from the painted surface, it is known as flaking defects. This type of defect occurs due to poor adhesion.
4. Sagging
The thickness of the painting should not be too much or too less. Sagging defect is formed due to the use of too much thick coat of paint on the surface.
5. Grinning
The grinning defect is formed due to the inadequate coating of the paint. In other words, the coating of the paint is not enough to cover the background seen.
6. Saponification
This defect is the development of soap patches on the painted surface. Saponification defect is created due to the chemical action of the alkalies.
7. Wrinkling
The defect of wrinkling is formed when the horizontal surface is painted too thickly.
8. Flashing
Development of glossy patches on the painted surface is known as flashing. This types of defects are formed due to the use of cheap paint or less skilful labour.
Defects in painting – MCQ
1. What is the defect in painting that lose small portion due to poor adhesion?
a) Bloom
b) Flaking
c) Sagging
d) Wrinkling
View Answer
b) Flaking
2. What is the defect in painting seen as glossy patches?
a) Fading.
b) Flaking.
c) Sagging.
d) Flashing
View Answer
d) Flashing
3. What causes the formation of soap patches on the painted surface?
a) Due to Poor Adhesion.
b) Due to the chemical action of the alkalies.
c) Due to moisture absorption.
d) All of these.
View Answer
b) Due to the chemical action of the alkalies.
4. Which defect occurs if a paint is applied too much on the surface?
a) Fading
b) Flaking
c) Sagging
d) Wrinkling
View Answer
c) Sagging
5. What is the defect in painting that occurs due to the inadequate coating of the paint
a) Fading
b) Flashing
c) Grinning
d) Bloom
View Answer
c) Grinning
6. What is the defect in painting seen as dull patches?
a) Wrinkling
b) Saponification
c) Bloom
d) Sagging
View Answer
c) Bloom
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