Which of the following is a characteristic of polyesters?

Polyesters are known for their excellent moisture resistance, which makes them a preferred choice in many coating applications, especially in environments where exposure to moisture is a concern. This characteristic allows polyester coatings to provide a durable finish that can withstand humid conditions without compromising their integrity, thus enhancing the longevity of surfaces coated with polyester.

In contrast, other characteristics associated with polyesters include limited pot life when compared to other resins, meaning they may not be ideal for applications requiring prolonged working times. Additionally, while polyesters can have decent abrasion resistance depending on the formulation, they are generally not the best choice if high abrasion resistance is a critical requirement. Similarly, flexibility can vary based on the specific type of polyester, but they are not universally noted for high flexibility compared to other materials like elastomers. Therefore, the choice of excellent moisture resistance accurately reflects a key attribute of polyesters in coating applications.