Microwave cavity shows rust, peeling paint, or exposed metal, sometimes accompanied by small sparks.

Safety first: Unplug the microwave before cleaning or inspecting rusted areas.

Steps to try:

• Clean area: Remove loose paint and rust flakes with a non-metallic scrub pad. Wipe clean and dry thoroughly.
• Touch-up: For minor spots, use microwave-safe cavity touch-up paint recommended by Café or GE Appliances, following instructions carefully.
• Monitor for arcing: After repair, run a short test with water. If arcing occurs near the repaired area, stop using the unit.
• Severe rust: If rust is extensive or metal is perforated, the cavity may be unsafe. Replacement of the microwave is usually recommended.