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Old 10-22-2020, 10:14 PM   #1
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Rustproofing - Best process?

I am dealing with the XM-Radio mounting plate that has rusted. I ordered a new 3 x 3 inch plate from Newmar and expect to receive the plate painted white and suceptible to rust.

How can I rustproof this small metal plate before it is installed?

1. Does powder coating prevent rust?

2. Or other means of rustproofing?

Thanks,

Rex
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Old 10-22-2020, 11:43 PM   #2
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electroless nickel plate
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Old 10-23-2020, 06:45 AM   #3
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If its that big of a concern, fabricate the plate out of aluminum.
Otherwise, put a good coat of paint on it and seal it with eternabond / dicor (I assume this is an antenna for the roof?)
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Old 10-23-2020, 09:55 AM   #4
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The plate cannot be aluminum since the XM-Radio Antennae attaches by magnetic attraction and it must have RF reflectance. That is why Newmar uses a steel plate. The problem is that Newmar does not rust proof the plate and in two years time our plate has rusted and the rust residue runs down the front cap and windshield. It is tough to remove and looks nasty.

I am thinking I will send the plate to be electroplated or powder coated.

Still seeking recommendations.

Thanks,

Rex
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Old 10-23-2020, 09:59 AM   #5
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As long as the metal is sealed from air/moisture, it will be rustproof. Thin, factory spray paint may have microscopic "holes" which will eventually allow air/moisture to reach the metal and rust will begin to form. You see that on the edges of some metal pieces where the paint is the thinnest. Powder coating is considerably thicker and would be a better shield, but any breaking of the coating from, say, tightening screws or bolts, will begin the rust process.

The suggestions of mounting and then covering with Dicor is the simplest and very effective as the entire plate and bolts/screws are protected from the weather. Of course, you could make a plate stainless steel if you don't want the plate to be covered with Dicor.

Edit: You posted as I typed. Can the plate be covered with Dicor? If not, then powder coating or electroplating is the option. Since it is a magnetic mount, it will be important the powder coat does not weaken the magnetic bond. Stainless steel also tends to have a weaker magnetic bond. I assume it is a very powerful magnet to hold position on a moving vehicle, however.
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Old 10-23-2020, 10:01 AM   #6
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You can have the plate powdered coated. I didn’t use a plate. I removed the rusty one and used 3M tape. No issues with reception, besides the normal poor reception I now get with all my vehicles.
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Old 10-23-2020, 10:04 AM   #7
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The plate cannot be aluminum. I originally thought stainless steel would work until someone mentioned that stainless steel has less magnetic attraction.
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Old 10-23-2020, 04:01 PM   #8
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I wouldn't rely on magnetic attraction to hold the plate in place. Glue it down. Seal it with Dicor. At least that's how I did mine. And Newmar did same for the GPS.
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