Question about Microwave Ovens

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I have rust on the door. The unit is 13 years old. Does it make sense to sand and paint the door, replace the door, or replace the unit. If sand and paint, what type of primer and finish paint. If replace the door how much will the part be and how hard is it to do? If replace the unit, what is the replacement model number

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Lots of questions that may be too difficult to help make a decion.

1) Depends on the degree of rust and whether it is inside or outside.
Outside is easier to deal with. Inside it would be subject to heat burning and odour as most are baked enamel finishes and are not paint at all, but a ceramic compund.
Outside can be rust removed which creates its own undercoat as it dries using the rust particles in an altered chemical state. An enamel paint is preferred or even a ceramic based compund.

replacingt the whole door may involve dollars to $100 unless you can find a second hand market for spares.

Frankly, because Microwaves have become so cheap now ( even secoid hand ones) you can pick them up from $50 to 200 depending on size and wattage. i would consider that it has had its time and replace the whole unit. After 13 years of service its time to retire it and move up. Newer ones are more power efficient and better sealed against radiation leaks than the older ones

Please rate my help++++Thanks for using FIXYA

Posted on Aug 01, 2010

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1 Answer

Coating inside oven has de-laminated and rust is forming under coating. Warranty?


Hello spark... no warranty unless the microwave is under 1 year. If there is a lot of rust and delamination you are best off to replace this oven.

The problem with delamination is that it exposes bare metal and can result in dangerous arcing.

If it is not real bad, sand off the rust and spray paint it with microwave cavity spray paint available at this link http://www.appliancezone.com/ShowProduct.aspx?ID=8338&AspxAutoDetectCookieSupport=1

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The paint in the cavity of my 6 year old microwave oven is peeling from the top. I don't know why. Is it safe to sand off the loose paint and touch it up?


Sand off the loose paint and make sure that there are no holes in the cavity. If there's holes the unit is not safe to use.

If it's just surface flaking, it should be safe to sand back with fine grade wet/dry sandpaper. We usually respray with automotive paint in a colour close to the cavity colour.

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It will have to be sanded smooth and clean and dried thoroughly.

Then if the steel seam is actually cracked / separated, then you can apply a very thin bead of steel-based epoxy "J-B WELD". When it dries thoroughly, you can sand it smooth.

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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My microwave is rusting inside. mainly the area where the turning wheels meet the base. I have sand and painted with microwave paint but after a few weeks the paint area around the wheels is rusting again.


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

Otherwise, you may get rust and/or arcing.

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

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Paint has chipped off bottom of MW


Moisture accumulation can sometimes be caused if the cooling fan is not running properly or if the vents in the back are blocked or there is not enough free space around the sides and back of the microwave.

One thing that helps is to keep the door open a few minutes after using it and to wipe down the inside after use.

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

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

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In my opinion ( and that is all it is).. I have always stood by the old litmus test whereby : if the cost to repair is close to or exceeds the cost to replace, then replacement makes sense. From the description you've presented and considering your micro is 12 years old, there is a reasonable chance that other components ( magnetron, transformer et al) will begin failing and end up costing more and more. So.. I would support your decision to replace with a new one. (again, this is only my opinion but I say this with sincerety and some experience with these appliances) ...Good Luck deciding..

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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.
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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.

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