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Old 10-24-2013, 10:11 PM   #1
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Underbody Rust

I recently purchased a '98 TJ that came from south texas, and went to the beach a lot. Because of that, it has some rust on the undercarriage. From what I can tell, it looks non structural (ill post some pics tomorrow). I was wondering how y'all would recommend getting rid of it and what coating or paint you would apply afterwards. I read some threads recommending POR-15 or Ospho and wanted to get some feedback on those products. Thanks for the help!

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Old 10-25-2013, 09:56 AM   #2
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Because you can see the underbelly of my Jeep so easily, rust on the undercarriage disturbed me. I ramped it up, power blasted it clean and painted on with a brush iron-oxide on every metal part including the drum brakes (dont touch the disks). Left to dry, spraypainted it black on top of the iron oxide for a bond that will last years.

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Old 10-25-2013, 10:49 AM   #3
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Because you can see the underbelly of my Jeep so easily, rust on the undercarriage disturbed me. I ramped it up, power blasted it clean and painted on with a brush iron-oxide on every metal part including the drum brakes (dont touch the disks). Left to dry, spraypainted it black on top of the iron oxide for a bond that will last years.
That is why I wanted to do something about it because you can see it. What did you blast it with? I was thinking of using a wire brush/grinder on a drill.
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Old 10-25-2013, 11:08 AM   #4
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No need to remove all rust, only flaky bits. The ferrous oxide binds freely with the ferric oxide(rust) and renders it stable. Now just paint.
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Old 10-25-2013, 11:19 AM   #5
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No need to remove all rust, only flaky bits. The ferrous oxide binds freely with the ferric oxide(rust) and renders it stable. Now just paint.
Where did you get the iron oxide at? thanks for the help!
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Old 10-25-2013, 03:08 PM   #6
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Get phosphoric acid, jack up your jeep and spary the underside down, coat it quick in base coat though cause itll start to surface rust right away. Havent had experience with the ferrous oxide but the phosphoric acid will eat right through all the rust in minutes, then just wipe it down with a cleaner. Worked great on mine!
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Old 10-26-2013, 03:48 AM   #7
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Where did you get the iron oxide at? thanks for the help!

I live in South Africa...
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Old 10-26-2013, 01:39 PM   #8
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Get phosphoric acid, jack up your jeep and spary the underside down, coat it quick in base coat though cause itll start to surface rust right away. Havent had experience with the ferrous oxide but the phosphoric acid will eat right through all the rust in minutes, then just wipe it down with a cleaner. Worked great on mine!
Also known as Naval Jelly. I lived in Michigan (Rust Central, thanks to road salt) and would dab it on with a brush. Wipe if off with rags when it was done, clean, dry and then hit with some primer. I'd recommend a few coats of paint over whatever was rusting.

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