What is a major drawback of using epoxy primer?

The correct response highlights that epoxy primer has a longer cure time compared to other types of primers. This longer cure time can impact the overall timeline of a paint job, especially in a busy shop environment where quick turnaround is essential. While epoxy primers are valued for their strong adhesion and resistance to corrosion, the extended cure period requires careful planning and can delay subsequent steps in the refinishing process, such as sanding or applying topcoats.

In contrast, the other potential issues mentioned—such as requiring high temperatures for optimal curing, sensitivity to UV light, and producing a rough finish—are either less significant concerns associated with epoxy primers or can be managed with proper application techniques. Understanding the properties and limitations of epoxy primers helps in making informed decisions when choosing the right materials for a specific job.