What is wicking in the context of coating systems?

Wicking refers to the ability of a liquid to be drawn along a surface or along porous materials, such as fibers, through capillary action. In the context of coating systems, this phenomenon can significantly impact the performance and durability of the coatings. For instance, if moisture or other liquids can wick into the substrate or along the fibers of a material that is being coated, it may lead to issues such as reduced adhesion, blistering, or other forms of failure in the coating.

Understanding wicking is essential for inspectors since it can inform the selection of coatings and the preparatory steps required to ensure proper application and long-term performance. This knowledge helps mitigate potential failures due to moisture ingress or other adverse conditions created by wicking action.