wettability
Technical term used in surface science, materials engineering, and related fields to describe how well a liquid spreads on or adheres to a solid surface.
Because this coating has high wettability, water spreads evenly over it.
Compound of 濡れ (nure, 'wetting', from verb 濡れる) and 性 (sei, 'property, nature'). The exact historical derivation is uncertain, but the term follows a common pattern for technical properties in Japanese.