Hello Miriam;
My name is peter. I am a retired field service appliance technician.
The reason your micro wave liner is cracking is the way you place the food in the microwave.
The rust is coming from the steel frame where the liner is cracked.
Go into the following video on how to repair the cracked liner. You can do this.
How to Repair Microwave Arc and Burn Marks Touch Up Paint
SOURCE: Rust inside the microwave.
The areas can be sanded and painted, but first make sure there are no holes rusted through. If it's all surface rust, then sand and clean as best as you can. If you have any areas rusted through - get rid of the microwave.
Use the paint sparingly - don't try to cover in one or two coats. Best results are obtained with very, very light coats drying 10 minutes or so (depending on the humidity) in between. 10- 15 coats usually works well.
It's best to do this outside, as you'll have lots of overspray.
As far as the paint - the best I've used for the last 20 years or so comes from A.M.I. Parts. You can find them @ www.amiparts.com or toll free 1-800-522-1264.
SOURCE: My microwave is rusting inside.
try the microwave touch-up paint again but this time clean the spots you sanded with rubbing alcohol. also make sure the rollers turn freely
SOURCE: my microwave oven has are rust spots;can I paint over them?
Yes, you can paint over the spots and no, it's not dangerous. I'd let the paint thoroughly dry before using the oven -- it could otherwise cause paint to buckle/ripple/etc.
SOURCE: Can I paint rust spots w/enamel paint? Dangerous to use?
You will need to buy a appliance high heat paint. the spray can works the best.
SOURCE: bottom of door inside badly rusted - oven works fine
Yes you can paint it.. Begin by removing the rust with either a wire brush or a thick paste product called naval jelly. Then prime the area and finally paint it with appliance paint, abailable in a spray can at most hardware stores in the color of your appliance.
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