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  #1  
Old 06-15-2010, 05:00 AM
BoomZilla BoomZilla is offline
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Default truck bed covers lead to rusty fenders?

I started repairing the rusty passenger side rear fender on my 2002 Ranger two days ago and noticed that the paint bubbles actually contained water. After sanding there were a couple of small spots that needed patching with epoxy putty but most of it was good metal. I ran out of time with one coat of primer on it and then it got rained on yesterday. When I took a look at it, the primer coat had started to bubble the same way the paint had previously. When I scratched at the bubbles, sure enough, they had water in them. I have to assume there are pinholes in the metal that I couldn't see when I was working on it and somehow water has chronically tracked from above down to the fender well.

I pulled off the soft cover and mounting rails thinking that the previous owner had done something stupid that left holes under the mounting rails above the wheel well. Nothing there. The only openings for water to get in are the two holes that you'd mount a ladder rack in. (I hadn't driven the truck so it wasn't splashed up from the tire)

The reason I suspect the cover for accelerating this process is that mine is the 'covered wagon' type, with the ribs. The cover's rails pull it out to just where the ladder rack holes are, so all the rain that falls on that half of the cover rolls down to those rails, then depending on the orientation of the truck, either down one of the two holes or off the side of the truck. The previous owner seemed like the retired type that probably had the truck parked in one spot for most of it's life which explains why one fender is so far advanced past the other.

Anyhow.. My evil plan is to get under there with a scraper and pull out all the rust and crap from above where the fender and the wheel well join. Then hit it with some brake cleaner and either rubber undercoat or primer and motorcycle chain lube after that dries. ..I need to seal those pinholes before I bother repairing the paint on the outside.

thoughts or advice? I'm not a perfectionist but I'd like to get at least a few years out of this truck before it rusts out. (any more)
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  #2  
Old 06-15-2010, 06:46 PM
DieselBrad DieselBrad is offline
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Default Re: truck bed covers lead to rusty fenders?

Is it rusting over the wheel well? The rust is coming from the back. No matter what you do on the outside the rust will keep coming from the back
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96 F350 Crewcab 460 5spd Vortech S/C 4X4 6" 35s
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86 F250 Reg Cab 6.9 4Spd 4x4 6" 35s (powerstoke,D60 5spd on the way)
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  #3  
Old 06-16-2010, 04:28 AM
BoomZilla BoomZilla is offline
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Default Re: truck bed covers lead to rusty fenders?

Yeah, its right over the wheel well where the inner piece is welded to the outer fender. The weird thing is that there is a lot of good metal left, the only reason the paint was bubbling on the outside is the pinholes. I bet the right treatment to the inside of the wheel well will give me a couple more years of pretty but if that turns out not to be the case I guess I'll just have to slap some fender flares on it
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  #4  
Old 06-16-2010, 06:55 PM
DieselBrad DieselBrad is offline
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Default Re: truck bed covers lead to rusty fenders?

Ok. there is your problem. The inner wheel well hold dirt salt, you name it. And it gets wets everytime your drive in the rain or spray a hose under your truck. And that metal has no paint on it back there so it is only a matter of time before the rust comes thru
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04 Supercab 4dr 4.0 5spd 4x4 EDGE. Daily Driver
96 F350 Crewcab 460 5spd Vortech S/C 4X4 6" 35s
94 Lightning Bassani headers back CAI Underdrive Pulleys
86 F250 Reg Cab 6.9 4Spd 4x4 6" 35s (powerstoke,D60 5spd on the way)
80 F350 Reg Cab 429 C6 4x4 L&L headers F450 rear springs All Out Pulling Truck(D60 Laddered Frame, 540cid coming)
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  #5  
Old 06-17-2010, 03:50 AM
Dantforth Dantforth is offline
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Default Re: truck bed covers lead to rusty fenders?

I am back to thinking about inner fenders again! Why did Ford ever take them out? What to do to a new truck to avoid all of these rust problems as I intend to keep my 2010 for a long time. Good luck with your repair. Dave
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  #6  
Old 06-17-2010, 04:49 PM
DieselBrad DieselBrad is offline
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Default Re: truck bed covers lead to rusty fenders?

They still have the inner fender wells, they just dont have the splash shields
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04 Supercab 4dr 4.0 5spd 4x4 EDGE. Daily Driver
96 F350 Crewcab 460 5spd Vortech S/C 4X4 6" 35s
94 Lightning Bassani headers back CAI Underdrive Pulleys
86 F250 Reg Cab 6.9 4Spd 4x4 6" 35s (powerstoke,D60 5spd on the way)
80 F350 Reg Cab 429 C6 4x4 L&L headers F450 rear springs All Out Pulling Truck(D60 Laddered Frame, 540cid coming)
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  #7  
Old 06-17-2010, 05:07 PM
BoomZilla BoomZilla is offline
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Default Re: truck bed covers lead to rusty fenders?

you'd think a cheap plastic part that would keep the fenders from rusting out would be worth the added cost.. No serious worries here as its all still good solid metal around the wheel well, just really weird pinholes that have been weeping water through from the inside and bubbling the paint.. Materials defect maybe? I just wish I had a lift handy so I could really get up there behind the body panel. I hate laying on my back working under a vehicle.
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  #8  
Old 06-17-2010, 05:22 PM
DieselBrad DieselBrad is offline
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Default Re: truck bed covers lead to rusty fenders?

Quote:
Originally Posted by BoomZilla View Post
you'd think a cheap plastic part that would keep the fenders from rusting out would be worth the added cost.. No serious worries here as its all still good solid metal around the wheel well, just really weird pinholes that have been weeping water through from the inside and bubbling the paint.. Materials defect maybe? I just wish I had a lift handy so I could really get up there behind the body panel. I hate laying on my back working under a vehicle.
If the truck would never rot out or brake down , you wouldnt go buy a new one to replace it. Why do you think the 300 6 cyl got dumped? i was TOO GOOD
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04 Supercab 4dr 4.0 5spd 4x4 EDGE. Daily Driver
96 F350 Crewcab 460 5spd Vortech S/C 4X4 6" 35s
94 Lightning Bassani headers back CAI Underdrive Pulleys
86 F250 Reg Cab 6.9 4Spd 4x4 6" 35s (powerstoke,D60 5spd on the way)
80 F350 Reg Cab 429 C6 4x4 L&L headers F450 rear springs All Out Pulling Truck(D60 Laddered Frame, 540cid coming)
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  #9  
Old 06-18-2010, 05:53 AM
BoomZilla BoomZilla is offline
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Default Re: truck bed covers lead to rusty fenders?

Ways to emotionally deal with a rusting truck based on various religions:

Buddhism: Try not to enjoy the truck's perfection in the beginning so that you won't be disappointed when it starts suffering.

Christianity: Do well with this truck you have now and you will be rewarded with a far superior truck when this one fails completely.

Bokononism: Do doodly do, doodly do, doodly do, What it must, muddily must muddily must, Until it rust, bodily rust, bodily bust.

..ok, maybe bokononism isn't a ~real~ religion...
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  #10  
Old 06-18-2010, 11:02 AM
Boghog1 Boghog1 is offline
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Default Re: truck bed covers lead to rusty fenders?

Quote:
Originally Posted by Dantforth View Post
I am back to thinking about inner fenders again! Why did Ford ever take them out? What to do to a new truck to avoid all of these rust problems as I intend to keep my 2010 for a long time. Good luck with your repair. Dave
here in the northeast the old timers use oil undercoating, now since the EPA frowns upon that there is some new stuff I have heard good things about called fluid film I plan on trying it this year.

Oil undercoating is messy as all get out and you get dirty when ever you work on your truck but bolts come out easy and rust is not an issue. it does need to be done every year though
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  #11  
Old 06-19-2010, 04:28 AM
DieselBrad DieselBrad is offline
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Default Re: truck bed covers lead to rusty fenders?

Quote:
Originally Posted by Boghog1 View Post
here in the northeast the old timers use oil undercoating, now since the EPA frowns upon that there is some new stuff I have heard good things about called fluid film I plan on trying it this year.

Oil undercoating is messy as all get out and you get dirty when ever you work on your truck but bolts come out easy and rust is not an issue. it does need to be done every year though
Thanks for that link. I way have to use that in my cherry 4 d00r to keep it cherry, you know how metal sweats from sitting
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04 Supercab 4dr 4.0 5spd 4x4 EDGE. Daily Driver
96 F350 Crewcab 460 5spd Vortech S/C 4X4 6" 35s
94 Lightning Bassani headers back CAI Underdrive Pulleys
86 F250 Reg Cab 6.9 4Spd 4x4 6" 35s (powerstoke,D60 5spd on the way)
80 F350 Reg Cab 429 C6 4x4 L&L headers F450 rear springs All Out Pulling Truck(D60 Laddered Frame, 540cid coming)
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  #12  
Old 06-19-2010, 06:20 AM
BoomZilla BoomZilla is offline
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Default Re: truck bed covers lead to rusty fenders?

I looked at that fluid film site and it seems worth playing with, but I wonder if it will wick enough to get into the nooks and crannies.
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  #13  
Old 06-19-2010, 06:39 PM
Boghog1 Boghog1 is offline
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Default Re: truck bed covers lead to rusty fenders?

well from the one person I know that used it says it does wick, I guess it would be like using veggie oil instead of petro
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