FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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What is likely to occur if HYDRATED wash primer is applied to unpainted aluminum and then about 30 to 40 minutes later a finish topcoat, when the humidity is low?

  1. Immediate corrosion

  2. A matte finish

  3. Peeling after a few days

  4. A glossy, blush-free finish

The correct answer is: A glossy, blush-free finish

When applying hydrated wash primer to unpainted aluminum, it is crucial to consider the environmental conditions, especially the humidity level. In low humidity conditions, the thinner in the primer can evaporate faster, allowing for a smooth and glossy finish with no blush or imperfections. This rapid evaporation of the thinner can lead to a quicker drying time, resulting in a well-adhered finish topcoat that is glossy and free of defects. Therefore, choosing option D, a glossy, blush-free finish, as the correct answer is the most appropriate based on the scenario described.

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