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Old 06-07-2012, 02:29 PM   #1
bpang1
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Default Undercarriage / Undercar Care

As many of you in the midwest know, there was a recent recall for our cars because of control arm failure due to rust. I had my recall service done here in WA as we have moved and they basically just put a new coating of whatever that undercar stuff is.

I also had a mechanic guess that my wife's car was in the midwest due to a lot of rust under the car during an oil change.

These two incidents got me thinking, "is there a way to refinish the undercarriage?". Like can I just wash the undercarriage then apply more undercoating via rattle-can or do I need a professional to do it to make sure I don't hit anything that I shouldn't?
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Old 06-07-2012, 06:06 PM   #2
djinn
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what i would do if I was going to tackle the job myself would be to sand down the rusted parts then apply something like bed liner or some type of rust proof paint.
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Old 06-07-2012, 06:24 PM   #3
Xjawgi
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I will be tackling the undercarriage of my 02 in the next few weeks. Im in the middle of an engine rebuild so i have some time to clean the undercarriage up. I will wirewheel everything, then pressure wash it. Once its good and clean i will use a bedliner like herculiner or duplicolors bed armor. Ill post up pics when i start.

I just did something similar to my jeep and it came out great.
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Old 06-12-2012, 02:08 AM   #4
bpang1
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^^^Will look forward to that.

Seems like a solid plan just not sure if I can execute as good as others ha ha ha!
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Old 06-15-2012, 11:59 AM   #5
wrxfr3ak227
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Subscribed!
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Old 06-16-2012, 01:34 AM   #6
Bikelok
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When I lived in NY, I used to get under my car 2-3 times a month in the winter months to rinse off all the salt and crap(not with high pressure). At the beginning and end of the winter season I would spend several hours with a penetrating oil(like WD-40) on all the bolts then rub as much of all the other components down with the same. When I left NY after 10 years of daily driving my car looked like it was a California car.
In the OP's case, get under your car and scrub, scrub, wire brush, sand and scrub some more. Shoot every bolt with oil, refinish whatever rusty bit you can. You may have to repeat these steps.
Be careful with undercoating crap. It does protect but is a pain if you spray it on stuff you need to work on. The stuff can be sloppy.
Personally I will not stand for rust on or under my car so I get very anal about it. You can go as far or not as you like.
Yes I do detail under my car. Not saying you have to though.
Good luck
Can't wait to see your pics.
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Old 06-16-2012, 01:30 PM   #7
Dpalmer
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Default underbody

Just the tread I need to subscribe to. I just bought a 2002 WRX and the under body in the rear has some oxidation and surface rust. I'm looking forward to the pics!
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Old 06-16-2012, 01:37 PM   #8
spoolinsti05
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I use the 3m undercoating expensive but look's nice actually dries. My car's are worth spending the 9 dollars a can on. And like said before wire brush and pressure washer. maybe some sand paper.
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Old 06-17-2012, 02:16 AM   #9
Smoke
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Blake, maybe you can try coating your undercarriage with Por-50 (or whatever the number is)?

My car's undercarriage has seen a lot of abuse because I live on gravel roads. Definitely can't enjoy the stainless steel exhausts, or clean undercarriage.
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Old 06-17-2012, 07:22 PM   #10
XsoberX
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POR-15 (Paint over rust 15), also, if you use POR15, you should also check out the acids/etches they sell as well, http://www.canada-por15.com/merchant...ory_Code=POR15 (I know, canadian website, but that's useful for me), as well as the product itself http://www.canada-por15.com/merchant...ory_Code=POR15
The body shop I work at uses this stuff on older cars we have come in that aren't actually getting rust fixed, but have rusty panels that we are working on (customer doesn't want to pay for the rust work, but it's still getting painted). Great product, and if you use it as a preventative instead of a remedy, way better.
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Old 07-30-2012, 11:22 PM   #11
wearywanderer
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I read somewhere today that washing the undercarriage can wash away protectants like grease and lead to quicker rusting... is that true?

I live in Ottawa and they use a lot of salt and sand during the winter months. I run my car through Shell's touchless car wash that is supposed to include an undercarriage cleaning as well.
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Old 08-01-2012, 06:13 PM   #12
FCmaniac
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Another option which I've been considering for my Forester is Chassis Saver paint. It's basically POR-15 but cheaper from what I've read.
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Old 08-01-2012, 06:25 PM   #13
bpang1
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^^^Yeah I might try something like that.

I just did the brakes on my wife's Altima which spent just as long in the midwest and everything was rusted...had to replace both front caliper brackets because the pin thingies were stuck in the holes.
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Old 08-01-2012, 06:30 PM   #14
FCmaniac
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^^ yup, rust sucks... the underside of my Forester was/is a rusty mess. I hit it with a wire brush, some naval jelly and then some rustoleum paint about a year ago but I need to do it again and be more thorough this time. I'm thinking about using the chassis saver this time around since I've read great reviews on it.
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Old 08-01-2012, 06:36 PM   #15
FCmaniac
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Quote:
Originally Posted by wearywanderer View Post
I read somewhere today that washing the undercarriage can wash away protectants like grease and lead to quicker rusting... is that true?

I live in Ottawa and they use a lot of salt and sand during the winter months. I run my car through Shell's touchless car wash that is supposed to include an undercarriage cleaning as well.
After driving through salted roads when the roads are mostly back to normal, I include the undercarriage pressure wash in the drive through touchless wash. The thought of leaving that road salt and mag chloride or whatever solution pasted all under the car for longer than a week doesn't sit well with me. I doubt the risk is greater than the benefit of washing the undercarriage.
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Old 08-04-2012, 09:19 AM   #16
Groundassault
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you could always use this stuff----> http://www.roversnorth.com/m-19-waxoyl.aspx
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Old 08-05-2012, 01:23 AM   #17
JerseyDubbin
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I know POR-15 is pretty big in the Jeep world and I've seen a lot of people using it. Another option is to wire brush, then prime/paint with rustoleum, and then do a bed liner. I used UPOL-raptor in my Jeep and loved it.
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Old 08-06-2012, 08:39 PM   #18
PsychoFunk
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I just got a new WRX and I live in the North, so is rustproofing worth $450? I've been checking out Ziebarts because they seem to be the best at it. Just looking to learn from other experiences.
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Old 08-07-2012, 02:23 PM   #19
Astronautalis
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If your in Canada this is the top rust control.

http://krown.ca/process.php
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Old 08-07-2012, 07:09 PM   #20
Big-E
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Boeshield T-9

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Old 08-10-2012, 04:45 AM   #21
swagen
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what is the stuff the dealers are using to rust proof the control arms?
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