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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 05-09-2014, 02:31 AM   #1
xevman
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Join Date: Apr 2014
Location: Melbourne
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My Ride: 2000 323i
e46 rust concern

Hey guys today i was inspecting my car and noticed a piece of mud that was stuck inside my door trim. I pulled it off and noticed that surface rust had started to form underneath the mud. Should i be concerned about it? i sprayed a good amount of wd40 on it to stop it from spreading but what should i do about it?

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Old 05-09-2014, 04:51 AM   #2
jjp735i
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Join Date: Oct 2012
Location: Pittsburgh
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My Ride: 05 545i & 03 325xi
Living in the northeast all my life I have to say, YES, be concerned. You need to grind it all off and get rid of it. Rust will never stop spreading once started.

Properly done, you can stop it. Sand, grind, use some good anti-rust and paint and seal. But get rid of it now before it's to late.

They do sell some good stuff that will turn it rock hard and black, but I don't remember the name of hand, but it works good and will not spread. Still, best way is to grind it off and treat it and paint.

Good luck.
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Old 05-09-2014, 07:38 AM   #3
jeepo23
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Quote:
Originally Posted by jjp735i View Post
Living in the northeast all my life I have to say, YES, be concerned. You need to grind it all off and get rid of it. Rust will never stop spreading once started.

Properly done, you can stop it. Sand, grind, use some good anti-rust and paint and seal. But get rid of it now before it's to late.

They do sell some good stuff that will turn it rock hard and black, but I don't remember the name of hand, but it works good and will not spread. Still, best way is to grind it off and treat it and paint.

Good luck.
It's POR15.

Stuff works, if done properly, takes some work.
I got rust on my ride also, mainly on the door lips down below.. hopefully in the next month or so I'll tackle that and planned to use POR15.
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Old 05-09-2014, 09:55 AM   #4
choxor
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That's the rust you see. The area needs to be ground out to determine how bad it really is. Take it to a body shop. Rust is a cancer.
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Old 05-09-2014, 11:21 AM   #5
hitbyastick
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Body shop is the best solution, but there is a product called Rust Bullet that is silver in color and very comparable to POR15 and some say better. If you DIY I recommend mechanical abrasion, naval jelly, then an epoxy sealer such as Rust Bullet or POR15.
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Old 05-10-2014, 02:12 PM   #6
shovelit
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My Ride: 03 325xi and 04 330x
I just had some rust taken care of last week. Tiny blister on left rear 1/4 panel where the bumper cover meets it.
Body shop removed the bumper cover and found same thing on the right just not showing yet.
They did a FANTASTIC job and the price was more than fair.
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