Why is surface cleanliness important in coating applications?

Surface cleanliness is crucial in coating applications primarily because it is critical for adhesion. For a coating to perform effectively, it needs to bond properly to the substrate underneath. Contaminants such as dust, dirt, grease, or previous coatings can create barriers that prevent proper adhesion. When the surface isn't clean, the coating may not adhere well, leading to issues such as peeling, flaking, or chipping.

Good adhesion is foundational to the longevity and durability of the coating system. A clean surface allows for the best possible interaction between the coating and substrate, ensuring that the coating can provide the desired protection and performance.

While factors like color accuracy, moisture resistance, and prevention of surface cracking are important in their own right, they depend on the integrity of the adhesion between the coating and the surface. If the adhesion is compromised due to a lack of cleanliness, it can ultimately lead to failures in all these other areas.