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Discussion Starter #1
Yesterday I gave myself a good sit-up, push-up, stand-up / get-down workout by scraping and spot POR-15'ing my rocker sheetmetal.

Then I decided it was time to hit the visible surface rust on the subframe. After pulling the air dam, I realized that the whole subframe is coated in a waxy undercoat. The parts that were beginning to show rust were in the line of fire of road splash and grime, and the coating had worn off.

Was this something Ford did in Gen4? Or have I just missed it altogether when playing with my past Gens 1-3?

Anyway, because I have a couple bottles of left-over professional Waxoyl underbody (heavy bitumen/asphalt + wax), and after treating the rust, I slathered on the stuff.
 

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My 94 front subframe crossmember has a sorta medium soft sticky black asphalt like coating.
 

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Looks like Ford used this for many years, and I never noticed...

Short of a professional sprayer with a heated spray head, the stuff is miserable to put on. It would be much easier if I could turn the car upside down...
 

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I believe either my G2 SHO's subframe has that, or its just alot of chemicles / fluids that fell onto it, but its a black asphault like texture that hurts if you touch it.
 

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Mine has that grunge/crud on it as well.
 

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QUOTE (showec8 @ Apr 26 2009, 12:02 PM) index.php?act=findpost&pid=720738
my 98 has no coating on it whats so ever. beside the oil from the oil pan leak[/b]
Hmm - beginning to wonder if this is a Chicago assembly thing and maybe not done in Atlanta for cars slated for Southern delivery...
 

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My 94 ws built in Atlanta & it has the goop on it!!!!

Maybe his has been replaced????
 

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QUOTE (OldWagon @ Apr 26 2009, 05:07 PM) index.php?act=findpost&pid=720784
QUOTE (showec8 @ Apr 26 2009, 12:02 PM) index.php?act=findpost&pid=720738
my 98 has no coating on it whats so ever. beside the oil from the oil pan leak[/b]
Hmm - beginning to wonder if this is a Chicago assembly thing and maybe not done in Atlanta for cars slated for Southern delivery...
[/b][/quote]
mine is originally a ca car not sure what plant mine was built at but will check
 

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Mine appears to be uncoated metal with surface rust. But who knows what car that was pulled off of as it is a LKQ part.
 

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In lieu of paint Ford used a cosmoline type product on the front subframe and surrounding assemblies. The advantages of the cosmoline over paint were its ability to heal if chipped and better corrosion protection. When new the coating was very pliable and remained so for about 3-4 years before it started to dry out and harden up.
 

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Discussion Starter #13
Thanks, theamcguy -- how did you track this down?

Where it has not been abraded off, mine is still quite pliable and waxy. I've now covered most of the abraded areas with a similar goop... still want to thin it and flow it internally (Ford likely dipped it) in some of the box frame areas.
 
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