How to Repair Microwave Rust

Even if you have a top-tier microwave, all appliances break down over time. One issue you may see is that the accumulation of food debris and moisture in the microwave oven cavity will cause rust. It should be clear that rust is not microwave-safe and might cause dangerous arcing inside your appliance. Any kind of malfunctioning electrical component will make your device unsafe and is a genuine fire hazard. So, to keep your home safe and maintain food safety, you need to know how to repair microwave rust.

Please keep in mind that, no matter how you look at it, a rusty microwave oven is a safety hazard, and it’s possible that you may have a device beyond repair. If there is a high amount of damage to your unit, a coat of paint won’t help. In addition, if your rusted microwave has external surface rust and a cavity with multiple damp rust spots, it may be too late. This is a far more serious situation than a defective microwave oven that starts when the door is open.

For more articles on microwave repair, check out how to fix a microwave door switch and how to repair a magnetron in a microwave.

So, assuming the damage isn’t too bad, grab some microwave-safe paint, and we can fix your rusty microwave.

How to Fix Microwave Rust Damage

Tools: Rubber gloves, sandpaper, microwave cavity paint, cleaning solution, soap, damp cloth, dry cloth

STEP 1 Unplug the Microwave

Before exposing your microwave cavity walls to a damp cloth and soapy water, unplug the unit. Let your microwave sit for 30 minutes or longer before performing any microwave repair or service to let it completely discharge. Be especially careful if you notice electrical issues like your microwave starting with the door closed.

STEP 2 Clean the Rust Spots

Use a soapy bowl of water and a clean cloth to wash away any food particles or stains. Then, use a clean cloth to dry the cavity metal.

STEP 3 Use Sandpaper to Clear Surface Rust

Use sandpaper to smooth out the rust damage and paint chips. You can also use a flat metal tool or a metal brush to clean the rusted surface.

STEP 4 Clean the Sanded Areas

Use a cloth to wipe away any debris from the rust spots, and let the microwave dry with the door open.

STEP 5 Prep the Microwave for Paint

Do one more pass with a dry rag to ensure your microwave is free from all debris and ready to paint. You can also consider going over the microwave with 90+% alcohol and letting it dry.

STEP 6Paint the Microwave

Microwave cavity paint is usually enamel-based. In addition, you can use appliance-safe spray paint. Lastly, make sure to take breaks so each coat of paint can dry.

STEP 7 Let the Paint Dry

Leave the microwave door open for 24 hours to make sure the paint is dry.

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