Question

Match the following in the context of paints.

a.	Bleeding	1.	It is the swelling of the paint film generally caused by moisture or volatile substances
b.	Bittiness	2.	The diffusion of coloured material into the upper coat from the under coat
c.	Blistering	3.	The appearance of a whitish substance on a surface of varnish or enamel.
d.	Blooming	4.	A condition in which small particles project above the surfaces of the film of paint or varnish yielding a rough surface.

1. a - 4, b - 2, c - 1, d - 3
2. a - 2, b - 4, c - 3, d - 1
3. a - 1, b - 4, c - 2, d - 3
4. a - 2, b - 4, c - 1, d - 3

Answer 1

Correct Answer - Option 4 : a - 2, b - 4, c - 1, d - 3

Concepts:

The common defects in paints are:

1. Blistering and Peeling:  Blistering and peeling are defects in which swelling of the paint film occurs caused by the formation of an air bubble under the paint film due to the presence of moisture or oil or grease matter. If it is due to moisture then it is called peeling and if it is due to oil and grease matter then it is called blistering.

2. Fading: Fading is the discoloration of the paint surface due to atmospheric agencies such as sunlight, moisture.

3. Grinning: The visibility of background due to insufficient opacity of paint film even after the final coat is called as grinning.

4. Chalking: Chalking is the formation of powder on the painted surface. This is due to the use of insufficient oil in the primer.

5. Flaking: The detachment of paint film from the surface is called flaking. It occurs when the bond between surface and paint film is poor. 

6. Blooming: The formation of dull patches on painted surface is called blooming  It is due to  improper ventilation, weathering, defective paint, etc.

7. Bittiness: Bittiness is a condition in which small particles project above the surfaces of the film of paint or varnish yielding a rough surface. This may be due to dirty surface, dirty brushes or dirty atmosphere.

8. Bleeding: The diffusion of coloured material into the upper coat from the under coat.