If it's paint peeling, then once that paint is gone, rust will set in, which can cause arcing and disintegration of the chassis, when ruins the oven.
This peeling is usually the result of excess moisture accumulating in the oven due to blocked air vents or poor fan circulation.
Once those two issues have been ruled out or dealt with, then always be sure to dry out or leave the microwave open after use.
The peeling paint will need to be removed, then the area should be sanded.
Then you can apply some
high-temperature appliance paint, available from places like Wal-Mart,
Lowe's or Builder's Square.
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