Bottom is rusted in underneath the little wheels

HI,
If you are able to spent money for a new Microwave then go for a new one.
If you are interested to repair and reuse the existing Microwave then keep on thing in mind, if you paint it then also it will not lasts for a long time as the metal underneath is rusted.
Ajin

It is more likely one of the little wheels is not turning causing the squeek. You might want to take the glass off and check the little wheels, because it will eventually cause a problem with the drive motor.

Since the cavity metal of the oven is chipped or charred, it will have to be sanded smooth and clean.

Then you can apply some high-temperature appliance paint, available from places like Wal-Mart or Lowe's.

If it is not repaired, the rust will worsen until the cavity is damaged beyond repair.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Hi Lowell,

Being 10 years old, any money you put into it would be a waste. It has served you well, time to replace it.

This is often caused by spills and condensation.

The metal will have to be sanded smooth and clean.

You can use a wire brush and naval jelly to get rid of the rust.

If any rust remains, you can use Rust Reformer paint to stop the rust process, then sand it smooth when it's dry.

Then you can apply some high-temperature appliance paint, available from places like Wal-Mart or Lowe's.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Yes you can, it is a painted surface correct? If so buy some rust inhibitor spay or primer and spary the bottom and then paint. Make sure you tape off any vents on the bottom before you do anything

Hi,

As long as the oven's metal bottom is sound underneath the rust, there isn't a problem. The cooking chamber walls are so thick and highly conducting that they reflect the microwaves extremely well even when they have a little rust on them. However, if the metal is so rusted that it loses most of its conductivity in the rust sites, you'll get local heating across the rusty patches and eventually leakage of microwaves. If you're really concerned that there may be trouble, run the microwave oven empty for about 20 seconds and then (carefully!) touch the rusty spots. If they aren't hot, then the metal underneath is doing its job just fine.

Thanks.

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

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.

Enamel should work, but appliance paint is better.

We're happy to help and we appreciate your thoughtful rating of our answer.

THERE IS SPECIAL MWAVE CAVITY SPRAY .MAKE SURE YOU SANDPAPER IT THEN USE NORMAL PRIMA ALLOW TO DRY USE FINE SANDPAPER JUST TO MAKE SURFACE RIGID THE SPRAY