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Old 06-11-2005, 11:31 PM
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Goo on the bottom?

In my chevelle, the whole underside except for the frame appears to be covered in a thin layer of black tar looking substance, its sticky to the touch.
Anybody have any idea what the heck this stuff is? Should i be concerned about scraping it off?
I would think it would be allright because its kinda acting like a sealant keeping water and crud out so my car looks very nice for being 30 something years old.

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Old 06-11-2005, 11:36 PM
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if its a old clean chevelle and its not oil on the bottom it more then likely the coating to protect (like on a brand new CHEVY truck at dealership are all black road coating protected go look )
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Old 06-12-2005, 12:10 AM
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Probably undercoating or some kind of rustproofing. Maybe it was rusty underneath and someone shot some underneath to cover it up. Or maybe it was used to seal underneath. If it is undercoating and you wanted to clean it off, it is a mess. Had some shot underneath a hood of a car I painted once, and It sucked getting it all off. Heat and a scraper wasn't doing much, ended up using kerosene and scrubbing to get it off, and it was a mess and wasn't fun playing around in kerosene. It is kind of a fire hazard.
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Old 06-12-2005, 10:25 AM
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OK im 80% sure the car is an older restoration, so more than likely it is just rustproofing the guy put on.
So sience i dont plan on doing a frame off resto and everything it covers is lookin good i think i will just leave it on for the time being.
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Old 06-12-2005, 10:35 AM
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Just be sure and check it over good (the frame) so you DON'T miss any rust.

It is a MAJOR pita to get any undercoating off and there is no "best" way outside of A LOT of elbow grease.
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Old 06-12-2005, 10:59 AM
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if you do decide to get rid of it, the best way I've found to get rid of any massive amounts of sticky stuff is dry ice, freeze it, then just chip it off...works great, is clean, and doesn't cost much.
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Old 06-12-2005, 07:11 PM
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Thats a great idea about the dry ice, but i have a few body issues that need more attention than this, so it will probably be put off for a while, maybe indefinately because it dosnt seem to be hiding any sort of rust whatsoever.

But it is good to know that it is just an undercoating thing instead of massive grime buildup
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