Cosmoline Failure?

JHZR2

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This truck isn’t new (96 with 439k miles), but it’s new to me. So never oil sprayed or whatnot inside.

Inhad the door card off, so I sprayed it all over in the entire door. It adhered perfectly and is just fine everywhere else. Which is why it has to be something to do with the standing water. No idea why it happened like that.

Can it be applied too think and never set/cure? I kind of thought that was the general idea when using it on stuff in storage.
 
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It's a type of wax so it never really hardens. In winter it's pretty hard to the touch. In summer months when it's hot it gets tacky and moves around. Reseals itself. It starts to melt over 130f.

Yes it does look like water is causing a problem. No I don't think it's too thick I think it's too thin actually. Here's what I would do. Get out a heat gun or hair dryer and use it in the door. The wax will melt. Make sure that seam is dried out. Then spray a lot thicker. All along the seam. Build it up so it's dripping out the hole and it's harder for water to remain. 2 heavy coats minimum. If it leaks out that seam down onto the door jamb that's good. Then mask off the door jamb and spray the area underneath that area of the seam. Doesn't have to be super heavy there but enough to be absorbed into the rust. That should work. Don't worry about getting it on the paint. It comes off with WD-40 or some type of oil. Or heat
 
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I just took this pic using flash. The 2006 Escalade 5 years after initial treatment. That body bushing is starting to bleed. Need to touch that up. But the frame still looks great. The surface rust on the bolt is still frozen in time. I see a couple of other areas that need a little help. But it's small stuff. I'm not respraying the entire vehicle every year.
 

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JHZR2

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Yes it does look like water is causing a problem. No I don't think it's too thick I think it's too thin actually. Here's what I would do. Get out a heat gun or hair dryer and use it in the door. The wax will melt. Make sure that seam is dried out. Then spray a lot thicker. All along the seam. Build it up so it's dripping out the hole and it's harder for water to remain. 2 heavy coats minimum. If it leaks out that seam down onto the door jamb that's good. Then mask off the door jamb and spray the area underneath that area of the seam. Doesn't have to be super heavy there but enough to be absorbed into the rust. That should work. Don't worry about getting it on the paint. It comes off with WD-40 or some type of oil. Or heat


I think you are right about too thin. I did just as you stated today. Built it up so it essentially fully fills the pinch seam trough at the bottom of the door. Let that set and then gummed more in there...

First:

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Second:

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Better but you still need more. Just let it rip. The surface rust should be flooded over and wax pouring out the drain hole. Then underneath the seam should be masked off and sprayed also. If it's damp in there use a hair dryer. If it gets on the paint or the door jamb don't worry about it. No worries getting it off. WD-40 will neutralize it
 

JHZR2

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Hmm. Maybe it needed more, but still not liking how the stuff absorbs water and cracks.

Maybe it’s a bad batch? Maybe because it’s in a low lying valley that holds water, versus a surface that sheds?

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JHZR2

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That black coating is primer paint, as far as I can tell.

even if it doesn’t “adhere” to it, the cosmolene still shouldn’t turn white when water sits on it. That’s a different issue, IMO.
 

JHZR2

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I had some corrosion x HD in my garage. It says it doesn’t harden, so I’m going to give it a try to cover the gaps in the cosmolene. Originally I was going to put woolwax or fluid film, but I found the corrosion x and figure it’s worth a shot. It may have more active chemistry than just the lanolin, which is good if seeping into crevices.

The can was really cold, so didn’t spray well. Some products have more gas entrained in the material - though fluid film and woolwax do this too, so the bubbles would be present had I used those other products instead. I purposely sprayed some spots and not others to see how it behaves with the primer. I’ll put more in later if this first spray looks ok and the propellant bubbles all come out.
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