What typically causes checking and cracking in paint?

The phenomenon of checking and cracking in paint is typically caused when lacquer loses its elasticity. This is crucial because lacquers are designed to be flexible to accommodate the natural expansion and contraction of underlying surfaces due to changes in temperature and humidity. Over time, factors such as aging, exposure to harsh environmental conditions, and the inherent characteristics of the paint itself can lead to a loss of this elasticity. Once the lacquer becomes rigid, it can no longer tolerate movement, resulting in the surface cracking or checking.

While moisture and application methods can influence paint performance, they do not directly lead to the cracking or loss of elasticity in lacquer itself. Quality paint can help prevent issues, but it does not cause the structural failures associated with checking and cracking.