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#4714989 - 04/03/18 10:08 AM Preventing Rust in Fender Wells
Snagglefoot Offline


Registered: 12/31/17
Posts: 1291
Loc: Alberta
Iím always amazed at how many trucks are out there with rusty fender wells. The remainder of the truck is usually just fine. While new trucks are coming out with plastic liners, what type of treatments seem to work to prevent the fender well rust on older models of trucks and cars. Thanks.

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#4714994 - 04/03/18 10:12 AM Re: Preventing Rust in Fender Wells [Re: Snagglefoot]
KrisZ Offline


Registered: 12/23/06
Posts: 7274
Loc: Toronto, Canada
Since you're in Canada, a can of Rust Cure from CT works very well and the included straw makes it easy to reach hidden areas. It sprays pretty far too.
_________________________
2015 Dodge Grand Caravan-21k miles.
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#4714999 - 04/03/18 10:18 AM Re: Preventing Rust in Fender Wells [Re: Snagglefoot]
Oldtom Offline


Registered: 07/05/14
Posts: 293
Loc: Maryland
Fluid film works great and creeps long dstances. The tailgate on my old Toyota was rusting thru at the lowet corner. I removed the inner panel and gave the rusty area a shot with Fluid Film from an aerosol can. Problem solved for about 4 years now.

The great thing about Fluid Film is no special surface prep. Spray it over existing rust and you are done. Vehicles in road salt and chemical brine areas should be sprayed every year. The chemical brine is way more corrosive than road salt.

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#4715013 - 04/03/18 10:32 AM Re: Preventing Rust in Fender Wells [Re: Oldtom]
khittner Offline


Registered: 07/13/12
Posts: 253
Loc: Michigan
Since you're in Canada, go get your truck sprayed at a good Krown shop. The shop I go to, Krown Sarnia, removes the taillight fixtures on my truck (a '95 Dodge Dakota) and get their long spray wand back to the wheel well area. It's the oil inside the fender, sprayed between the inner and outer fender panels, and that leaks out for a week or so thereafter (and creeps into crevices long after that), that's keeping my truck rust-free here in Saltbelt Michigan. I can't buy much bodywork and paint for the cost of my Krown resprays.


Edited by khittner (04/03/18 10:39 AM)

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#4715044 - 04/03/18 11:04 AM Re: Preventing Rust in Fender Wells [Re: khittner]
69GTX Offline


Registered: 09/23/15
Posts: 3742
Loc: Connecticut
I've driven my 2 Lincolns ('97 and '02) in 17 winters so far. And not a single bit of rust in the wheel wheels or quarters/fenders. Ford did something good with how they under-coated these wells and painted the cars. Very durable. And no rust ever developed into the wheel lips or lower quarters. I hope they're making them as durable today.
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2002 Lincoln Cont 4.6L DOHC/ 81K mi /PPlat 5w30/FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs

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#4715052 - 04/03/18 11:08 AM Re: Preventing Rust in Fender Wells [Re: Snagglefoot]
webfors Offline


Registered: 06/06/06
Posts: 4813
Loc: Great White North.. eh
Rust proofing spray is only as good as the level of contact with metal. Often you will find dirt/mud/buildup inside the wheel wells where the rust typically starts. Be sure to brush away this buildup before applying the rust control fluid.

This "mud" is the main cause of rust, IMO, since it traps moisture for extended periods of time. Whereas dirt/mud free metal would not be exposed to those extended periods of oxidation.

Step 1: clean the dirt/mud away from the seams/lips
Step 2: allow the area to dry
Step 3: apply rust control fluid

I did that with my old subaru, which was famous for rusts in those spots, and never had any corrosion issues.
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#4715075 - 04/03/18 11:35 AM Re: Preventing Rust in Fender Wells [Re: Snagglefoot]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1291
Loc: Alberta
Anyone try any of the spray can undercoatings on the inside lip of the fenderwell?

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#4715076 - 04/03/18 11:37 AM Re: Preventing Rust in Fender Wells [Re: Snagglefoot]
Oily_Thing Offline


Registered: 03/16/18
Posts: 14
Loc: Missouri
Chevrolet/GMC pickups have been rusting badly above the rear wheel wells and at the rear lower cab corners for 40 years. You would think they would figure out a fix by now.
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#4715087 - 04/03/18 11:45 AM Re: Preventing Rust in Fender Wells [Re: Snagglefoot]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1291
Loc: Alberta
I guess they want you to buy a new truck! LOL

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#4715101 - 04/03/18 11:52 AM Re: Preventing Rust in Fender Wells [Re: Snagglefoot]
Ducked Offline


Registered: 10/25/12
Posts: 4059
Loc: Taiwan
Vegetable oil.

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#4715120 - 04/03/18 12:09 PM Re: Preventing Rust in Fender Wells [Re: Snagglefoot]
LeakySeals Offline


Registered: 02/18/11
Posts: 6514
Loc: Hudson, NH
No more sticky slippery waxes that attract soot, sand, flake off. What a mess, dangerous too. I was underneath putting a jack stand in place and I could see the jack slipping off the frame. That was it for me. I switched to a combo of corroseal and Rustoleum rust reformer spray with tannic (the white bottle). So far, so good. Even if it eventually flakes off at 2 years, thats still so much better than FF
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#4715128 - 04/03/18 12:19 PM Re: Preventing Rust in Fender Wells [Re: Snagglefoot]
69GTX Offline


Registered: 09/23/15
Posts: 3742
Loc: Connecticut
I spent 4 hours last summer under my daily driver wire brushing small areas of surface rust on the undercarriage. Applied some Eastwood Corroless primer that I've had around for yrs. Almost all of it precautionary before white flaky stuff turns to brown/reddish stuff. The car will probably fall apart before rust ever is an issue. First daily driver I've ever been this anal on as far as preserving the paint and undercarriage.
_________________________
----------------

2002 Lincoln Cont 4.6L DOHC/ 81K mi /PPlat 5w30/FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs

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#4715155 - 04/03/18 12:47 PM Re: Preventing Rust in Fender Wells [Re: Snagglefoot]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7398
Loc: S California
Move to Phoenix?

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#4715255 - 04/03/18 02:39 PM Re: Preventing Rust in Fender Wells [Re: khittner]
Tdbo Offline


Registered: 08/18/09
Posts: 3199
Loc: Ohio
Originally Posted By: khittner
Since you're in Canada, go get your truck sprayed at a good Krown shop. The shop I go to, Krown Sarnia, removes the taillight fixtures on my truck (a '95 Dodge Dakota) and get their long spray wand back to the wheel well area. It's the oil inside the fender, sprayed between the inner and outer fender panels, and that leaks out for a week or so thereafter (and creeps into crevices long after that), that's keeping my truck rust-free here in Saltbelt Michigan. I can't buy much bodywork and paint for the cost of my Krown resprays.


+1.
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2012 Honda Accord LX-P 91K
2008 Ford Mustang Pony Package Convertible 16K
2006 Honda Odyssey EX-L 76K
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#4715308 - 04/03/18 03:39 PM Re: Preventing Rust in Fender Wells [Re: Oily_Thing]
ecotourist Offline


Registered: 07/09/08
Posts: 1037
Loc: British Columbia, Canada
What surprises me is that owners (of all sorts of vehicles) don't wash the inner side of the rear quarter panel, that part you can get at from inside the rear wheel well. Mud collects up there and if it never gets washed off, it just stays there, often damp and in contact with the sheet-metal. I can't think of a better way to make rust. Well yes I can, if you add a bit a of salt to it that would make it even better.

Check almost any vehicle. Curl your fingers around the lip above the rear wheels. They'll come back dirty. My BMW has practically eliminated that space but almost every other vehicle I've ever owned has a shelf up there that seems like it was designed to collect dirt.

I wash that area every time I wash a car (it's the last job before dumping the pail). And it's always dirty.

That's the first spot you see rusting on trucks especially - they have a wide dirt collection shelf right there.
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2000 BMW 528i 5MT
2007 Honda Accord EX-L 4Door V6 6MT

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