What is a common disadvantage of polyester coatings?

Polyester coatings are known for their relatively short pot life, which refers to the time during which the mixed coating remains usable before it begins to set or cure. This characteristic can create challenges during applications, particularly when large areas need to be coated or when conditions change rapidly. If the pot life is exceeded, the material may become unusable, resulting in waste and potential rework on a project.

The other options highlight different aspects of polyester coatings: while they may not cure particularly quickly compared to some other materials, they can cure without the need for heat, which offers flexibility in their application. In terms of moisture resistance, polyester coatings typically perform well, so this characteristic would not be seen as a disadvantage. Understanding the implications of pot life is essential for ensuring effective application and maximizing the utility of polyester coatings in various environments.