What can result from prolonged moisture exposure to aircraft coatings?

Prolonged moisture exposure to aircraft coatings can lead to delamination of the coatings. This occurs because moisture can penetrate beneath the coating surface, creating a separation between the coating and the substrate material. This separation is caused by the formation of bubbles or blisters as the moisture compromises the adhesive properties of the coating. Delamination can significantly reduce the protective qualities of the coatings, exposing the underlying material to environmental conditions which may lead to corrosion or structural damage.

The other options do not accurately reflect the consequences of prolonged moisture exposure. Enhanced performance and increased durability suggest improvements, which would not typically occur with moisture damage. Improved radar evasion implies an advancement in stealth capabilities, which could not result from moisture-related degradation of coatings. Thus, delamination correctly identifies a critical issue that can arise under such conditions.