Case 1

Cause of Defects

A significant factor in paint chalking is weather exposure, particularly prolonged sun exposure. The sun’s UV rays penetrate the paint, breaking down the pigments and binders that hold it together. Over time, this leads to deterioration, making the paint brittle and forming a powdery substance on the surface, known as chalking. Additionally, sun exposure causes the paint to expand and contract with temperature changes, resulting in cracks in the paint film and exacerbating the issue. The sun’s heat can also cause the paint to dry too quickly, preventing proper adhesion to the surface and contributing to chalking.

A major cause of paint chalking is the use of low-quality paint. Paints made with inferior pigments and binders are more likely to chalk over time. These lower-grade pigments tend to fade and deteriorate, resulting in chalking. Similarly, the binders in subpar paint are often weaker, making the paint film more prone to cracking, peeling, and chalking. Additionally, low-quality paint often has issues with adhesion and durability, which can lead to improper adhesion to the surface and result in chalking, as well as peeling or flaking off in large sections over time.

Other causes include:

• instability of pigment such as linoxyn which is easily decomposed by ultraviolet light and oxygen.
• Insufficient binder.
  • A porous under coat by depriving the finishing coat of medium will cause early chalking.
• Over thinning