1.Walk me through how you'd prep a bare aluminum panel for primer.
Why they ask
Prep is where aircraft coatings fail. The lead wants to know if you understand that the primer only works as well as the surface under it.
How to answer
- Solvent clean first to remove oil and fingerprints, then scuff or abrade to the spec
- Apply conversion coating such as Alodine, keep it wet for the dwell time the tech data calls for, then rinse
- Do a water break test so you know the surface is actually clean
- Prime within the window the spec allows, wearing clean gloves so you don't contaminate the panel

