Which of the following is a concern related to low temperatures during coating application?

When applying coatings at low temperatures, one significant concern is the slower curing of chemically curing coatings. These types of coatings rely on chemical reactions that are temperature-dependent; as the temperature decreases, the rate of these reactions also slows down. This can lead to a longer time for the coating to achieve its desired properties, such as hardness and adhesion, which are critical for ensuring the longevity and performance of the applied finish.

In contrast, increased solvent evaporation and decreased viscosity are generally issues associated with high temperatures. At low temperatures, solvent evaporation rates tend to decrease, which can affect the drying time but is less of a concern than the curing aspect. Similarly, coatings usually become more viscous at lower temperatures rather than less, which can complicate application rather than support it. While extended pot life might occur at lower temperatures, this is not a primary concern with the application since it relates more to how long the coating mixture remains usable rather than its performance properties upon application. Thus, the primary concern at low temperatures is indeed the slower curing of chemically curing coatings.