Paint is basically a liquid material. It is a substance used as the final finish to all surface and as a coating to protect or decorate the surface. Paint is pigmented opaque material that completely covers and hides the surface to which it is applied. After drying it forms a thin film on painted surface i.e. walls and other components (i.e. metal, or wood) of the building or any other object.
For most of the people, paint is the colour on walls, timber, metal, bricks or outside/inside surfaces of their house. Furthermore, from the layman’s point of view paint is the colour of their car, boat or any other object/elements in routine life.
Also Read: What is the Paint?
Once you paint, several defects are observed. The defect arises as paint film is subjected to the chemical attack of atmosphere, sunlight, dust, and heat, all deteriorating it. The defect may also arise due to poor workmanship or poor material used.
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Patchiness in painting is one of the several defects on painted surface. The paint film is subjected to chemical attack of atmosphere, sunlight, dust, and heat, all deteriorating it.
Patchiness is known as the uneven finish or scratch like thing appearing on the putty-applied surfaces. It is caused due to the highly absorbent nature of the surface and presence of foreign matters in the putty leads to this defect. Newly constructed walls may have more problems of patchiness as they usually have high alkalinity on the surface.
Unskilled personnel may apply the thick coat of putty on the newly constructed wall to level up; however, this process is more prone to patchiness. There are various reasons why patchiness in paint occurred however; here we have listed few of them for better understanding,
01. Due to highly absorbent nature of surface
02. Application of finish coat over spot puttied surfaces
03. High alkalinity of surface (especially evident in new walls)
04. Incomplete drying of filler or putty
05. Application of thick coat of putty, which gives patchiness on subsequent drying