A mechanic observes rust spots on a file despite storage. What maintenance step was likely skipped?
Application of light oil before storage
Rust is the oxidation of steel that occurs when the bare metal surface is exposed to moisture and air.
A file has many exposed teeth, so before storage a thin film of light oil is wiped on to seal the steel from moisture and prevent corrosion.
If this oiling step is skipped, atmospheric humidity reaches the teeth and rust spots form even though the file is kept in storage.
Sharpening, polishing with emery, or fitting a plastic handle do not protect the stored surface from moisture, so they are not the missed maintenance step.
Hence, the answer is Application of light oil before storage.
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