Final answer:
Zinc chromate primer should not be used on exterior aircraft surfaces in areas exposed to high temperatures.
Step-by-step explanation:
Zinc chromate primer should not be used on exterior aircraft surfaces, including wheel wells and wing butts, and in areas that are exposed to temperatures exceeding a certain threshold.
The specific temperature that zinc chromate primer should not be exposed to depends on the application and manufacturer's recommendations. However, generally, zinc chromate primer should not be used in areas that are exposed to temperatures above 120°C (248°F).
Exposure to temperatures above this threshold can cause the zinc chromate primer to degrade, leading to reduced effectiveness in protecting the aircraft surface and potentially compromising its structural integrity.