MM formulated the question :
I have a Sanyo domestic microwave oven approximately 8 years old that
still functions all right. The problem is that the floor of the oven
on which the glass turntable rotates on its spindle is rusted through
in one or two places. The turntable still rotates okay, but if the
floor is left to rust through further, sooner or later the little
carrier wheels that support the turntable will get trapped and the
turntable will lock up or something.

How could I repair the base of the oven? I have thought of Kurust
first, followed by a layer of epoxy resin soaked fibreglass from
Halfords. Any other ideas? It seems daft to buy a new microwave if the
actual heating feature works fine.

Any small metal particals which become detached from the oven case will
causing arcing and burning - which is why rust in an oven gets rapidly
worse. Any repair you needs to be well bonded to the rest of the case
liner, if it is at all conductive to microwaves and any holes in the
lining can permit microwaves to escape and put you at risk. So
generally the only sensible economic option is to buy a new oven and if
you want longevity, get a stainless lined one.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk