Question about Microwave Ovens
It can lead to rust, which can eventually lead to leakage, so it should be fixed.
If the cavity metal of the oven is chipped or charred, it will have to be sanded smooth and clean and dried thoroughly.
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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Posted on Apr 23, 2008
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Jan 31, 2014 | Sharp R-930AK Convection/Microwave Oven
the microwave is sparking or arcing the waveguide cover might be
damaged and shorting out. Try removing the waveguide cover and see
if the problem goes away. If there are any damaged spots in the
microwave ceiling or sidewalls, repair them and paint them with
microwave oven paint. Replace the waveguide cover if it is burnt or
if it will not stay in place.
the microwave is sparking or arcing near one of the rack supports,
remove the support, repaint any bare metal, install a new support.
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