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Premium Member
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Discussion Starter #1
I've just had some rot taken care of in the rearmost part of my rockers, and I was thinking about trying to spray some rustproofing in there to help slow it down in future. Just wondered if anyone knows whether there is actually any space inside the rockers that you could spray rustproofing fluid into?

Looking at 94TchickinV8's album the front 2/3rds of the rocker looks to be full of some kind of foam/cement:

http://forums.tccoa.com/vbpicgallery.php?do=big&p=2721

And when I had mine repaired, the guy said there was a load of stuff in there that looked quite similar (from the pile of crap on the floor that he showed me). It looks like the rear ends may be hollow - the bit seems to go first from the pictures I've seen. Can anyone shed any light on the subject?
 

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Super Moderator
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That foam is supposed to help sound deadening, but the effect is to help rot out the rockers by holding water in the rockers.

If at all possible, pull that foam out.

Then you can have the insides sprayed with something like POR-15 first, then with a rust proofer.

RwP
 

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cut all rusty metal out, replace with new metal. Rust is like cancer once its there it spreads like wildfire. Then never drive it in the winter again.
 

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Just spray oil or something similar inside and hope for the best. I removed my rear speakers and sprayed Krown KL-73, the same product the rust proofing services spray into door bottoms, etc. The only real way to get rid of / stop rust is to cut it out and replace metal. I opted to just spray anywhere I could to help slow things down (if that's even possible).
 

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There are a bunch of products like that one you mentioned ThunderChecken. I used Evapo-Rust for removing rust from bolts and stuff when I rebuilt the front-end on my 'bird. The parts you want to remove the rust from ideally need to be submerged so it works better for some stuff versus others. There is some gel rust dissolver I've seen at the auto parts store, I can't remember the brand off-hand, that might be a better option?
 

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1994 Cougar XR7 DOHC/5-Speed
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I don't have much faith in internal coatings, seen way too many ziebarted MN12s with worse than average rust to believe it helps anything and granted there's better coatings out there but conceptually it's the same and I think anyone claiming success swallowed one hell of a placebo. I put more credence to an annual coating of kerosine/motor oil mixes.

Biggest problem these cars have with rust out is poor seam sealing and equally poor drainage. Figure out a way to prevent dirty liquid moisture getting in and give it someplace to go when it inevitably does. Take he bottoms of the front fenders for example:

This area is a major rust point, the windshield drains to them, as well as the sunroof if equipped. When it gets bad enough(especially when they get full of leaves) the front tips of the rockers start to rot out too. My solution? Ditch the fabric sound deadener material that absorbs water like a freaking sponge to start, then take out the stack of those god awful bare steel shims at the bottom of the fender and replace them with round plastic spacers. Why you ask? There's a drain channel stamped into the fender that's rendered USELESS by those flat steel shims! Huge improvement in drainage!

The rears are trickier but I've got a few ideas there too. 1. There's a giant window next to the fuel tank where the rear frame rails meet the rockers that I think let in a lot of water by way of underbody splash. This window just happens to be a straight shot to where the rockers rot out and I can't help but think a patch or baffle over it will help. 2. --And this will sound counterprocuctive-- drill a hole at the very bottom of the rocker panel just ahead of the wheelwell(not the wheel) joins the rocker. Same idea as the front, give the water somewhere to go, and you can extend the sunroof draintubes to use the same hole while your at it. 3. ditch all of the sound deadener/padding from inside the rear speaker holes and drill(which might be tricky, maybe a Dremel would be easier) a drain hole at the top of the rocker inside it for drainage(I think the wheelwells aren't seam sealed great or something because every MN12 I see up here has a shocking amount of rust starting there). I noticed a long time ago that SN95 Mustangs rarely have rocker rot out like these cars have and I poked around several to see how they were designed and low and behold the tops of the inner rockers don't even extend to the rear wheelwells, leaving a nice gap for drainage(and that was likely by design, 94/5 Mustangs had "functional" C scoops which would let in a lot of water).
 

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Discussion Starter #8
This is all fascinating, especially the last post about the way he panels go together. It was only the rear corners of my rockers that were affected. Rust has been cut out and I filled the rear wings behind the rear speakers with wax. I was thinking of making a drain hole just in front of the rear wheels and spraying wax/oil into the gap behind in the frame joint as it does seem to be just in the right place to help that section of the rocker rot out again.
 

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MaleWhore
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Matt, i completely agree with out on everything you said...i took my front wheel well liners off yesterday and found the bottom of the fenders filled with crap...and saw the spacers you are talking about...also saw the sponge fabric sound deadners hiding there behind the antenna motor...just terrible!

Ill have to find the rear holes you are talkin about! see if i can do some drilling mods to get that area safely drained
 

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MaleWhore
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I had weird little plants growing out of mine, they looked like alfalfa sprouts.
I never understood their purpose really...seem like they are for noise dampening from any wind noise or splashes that can be transmitted thru the wheel well cover into the opening between the door and the body?

My car is so loud, that would be my last concern really at this point...they wont be going back in...
 

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Super Moderator
1997 Thunderbird 4.6, 1998 Mark VIII LSC
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I had weird little plants growing out of mine, they looked like alfalfa sprouts.
Probably was from all the composting dead leaves, seeds and who knows what else behind it inside at the bottom of the fender.
 

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Dont put any foam type stuff in the rocker area its a sponge for moister.

For aircraft we use CorrosionX it is the only thing approved for the military and it claims to actually kill rust. You can purchase this stuff off amazon. Just drill a hole small enough to fit the red tube in and fog the area.
 
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