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This is potentially a very stupid question, but anyway. I'm in the process of restoring a c900, and I've got a question about the under-body. Basically, much of the frame is covered in a thick, greasy, gooey substance. I'm assuming it's some sort of rustproofing, but I'd like someone to confirm this for me. Also, if it is rust proofing, do you recommend I leave it as is, remove it or try to re-do it? Sorry if these questions sound dumb, but we generally don't need to worry about rust here in Australia. Links are below.

Thanks.

https://flic.kr/p/rrgHnZ
https://flic.kr/p/rFr29A
https://flic.kr/p/qLW67H
 

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If it's a tacky, tar like stuff I'd leave it. I had something similar on an my old '90 Ford Probe. It did a great job rust proofing and sound deadening. The only problem with it was that it wasn't on the door that was replaced after I got in an accident with the car. It was one of the only Probes of that age that wasn't starting to rust (except the replacement door).
 

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This is Bitumen rustproofing. Its good stuff and is 2nd to the factory stuff they put on. Some people dont like it as once it eventually starts to flake off, it traps bits of water here and there creating rust zones. But the good thing about this stuff is you only need to do it a few times for the life of the car. Other things will start rusting before the floor pan does.
 

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Up in Cleveland they "Oil Spray" the vehicles once a year for around $50. On a fall weekend, sometime the wait is 2-3 hours, so it's definitely popular.

A friend up there has a 2001 Jeep Cherokee that has no rust. But, if you have a clean concrete driveway, I wouldn't do it... Ron
 
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