Microwave cavity paint is peeling, rust is visible, or there are rust spots on the floor or walls.

Safety first: Unplug the microwave before cleaning or painting. Do not operate with large areas of bare metal exposed without proper repair.

Step-by-step checks:

• 1. Clean area: Remove loose paint and rust with a non-metallic scraper and fine sandpaper.
• 2. Dry thoroughly: Ensure the cavity is completely dry.
• 3. Apply microwave-safe paint: Use only microwave cavity touch-up paint recommended for high-frequency use. Apply thin, even coats and allow to cure fully.
• 4. Severe rust: If rust has penetrated deeply or structural integrity is compromised, replacement of the microwave is recommended.