Corrosion inhibiting primer is recommended to be used as a barrier between LO coatings and metal surfaces because of:

The recommendation to use corrosion inhibiting primer as a barrier between low observable (LO) coatings and metal surfaces is primarily due to dissimilar metal potential. When two different types of metals are in contact, they can create galvanic cells where corrosion can occur, especially if the metals have significantly different electrode potentials. In this scenario, the primer serves as a protective barrier that prevents moisture and other corrosive elements from reaching the metal surfaces.

This is crucial because low observable coatings are often applied to enhance radar-evading characteristics, and maintaining the integrity of the underlying metal is essential for both structural and functional performance. By using a corrosion-inhibiting primer, you help to ensure that the metal remains protected from corrosive processes that could lead to degradation over time. The effective management of corrosion aids in prolonging the life and performance of the aircraft's structure, ensuring operational effectiveness.

In contrast, considerations such as high thermal conductivity, cost efficiency, and structural integrity, while relevant in other contexts, do not directly address the specific need to mitigate corrosion due to dissimilar metal interactions. Thus, focusing on dissimilar metal potential aligns with the primary purpose of the primer in the context of corrosion prevention.