Which of the following factors is NOT part of the coating system evaluation?

The correct choice highlights that "type of coatings available" is not part of the coating system evaluation as it pertains more to the selection process rather than the evaluation itself. Coating system evaluation typically focuses on performance-related aspects such as durability, maintenance, and overall lifetime costs. The evaluation assesses how well a specific coating has performed in its application, which includes the longevity of the product, the associated annual maintenance costs, and the cumulative expenses throughout the system's lifecycle.

Conversely, the other factors—length of time the product lasts, maintenance cost per year, and overall cost over the life of the system—directly relate to the effectiveness and economic viability of the coating once it's in use. These elements provide insight into the practicality and suitability of the coating system for a given application, emphasizing the importance of evaluating performance outcomes rather than merely the available types of coatings. This distinction is essential for making informed decisions based on the practical application of the coatings rather than the theoretical options available.