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Old 01-06-2020, 01:09 PM   #1
onlinebiker
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Default Undercoating

I noted that the 2001 yellow SC2 we just picked up does not have undercoating. Neither does the first 2001 yelliw SC2. Our 96 SC2 also does not have it.

All of our other cars do have it.

How about yours? I assumed they all had it till last year when we got our 96.

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Old 01-06-2020, 02:47 PM   #2
me.theuser
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Default Re: Undercoating

neither my 2001 sl2 or 2002 sl1 have undercoating
not totally sure if my 96 sl1 or 98 sl1 had it but I don't think they did

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Old 01-06-2020, 10:39 PM   #3
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1997 SL2
Default Re: Undercoating

Is undercoating the black, rubbery stuff?

...
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Old 01-07-2020, 12:23 PM   #4
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Default Re: Undercoating

Unless you've been driving on fresh hot asphalt....

:P

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Old 01-07-2020, 03:01 PM   #5
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Default Re: Undercoating

You have to pay $100-$200 extra every year to have it redone and with workplace's like mine you can't use the work parking lot until it's done dripping.

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Old 01-07-2020, 04:44 PM   #6
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Default Re: Undercoating

Quote:
Originally Posted by fetchitfido View Post
You have to pay $100-$200 extra every year to have it redone and with workplace's like mine you can't use the work parking lot until it's done dripping.
What's it cost to have it removed?

Because I would rather not have it.

...
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Old 01-07-2020, 05:42 PM   #7
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Default Re: Undercoating

Drive hard and fast on a loose gravel road for weeks will do it.

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Old 01-07-2020, 07:18 PM   #8
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Default Re: Undercoating

Quote:
Originally Posted by fetchitfido View Post
You have to pay $100-$200 extra every year to have it redone and with workplace's like mine you can't use the work parking lot until it's done dripping.
Done dripping? Most undercoating doesn't drip. Maybe the more oil types do? That's not what I'd consider standard undercoating, Though.

...
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Old 01-07-2020, 08:07 PM   #9
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Default Re: Undercoating

Quote:
Originally Posted by toggenburg View Post
Drive hard and fast on a loose gravel road for weeks will do it.
I experimented trying to take it off with a pneumatic needle scaler. Whatta mess....

The problem is - it hides critical rust and makes it a mess to attempt fixing.

I would rather just not having it.

...
92 SC2
93 SC2
96 SC2
97 SL2
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01 SC2 x 2 yellow
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2 96 SC2
98 SC2 - rusty frame minus engine.

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Old 01-08-2020, 01:13 AM   #10
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Default Re: Undercoating

Quote:
Originally Posted by 454cid View Post
Done dripping? Most undercoating doesn't drip. Maybe the more oil types do? That's not what I'd consider standard undercoating, Though.
They don't care what it is, we use enough harsh, environment killing, chemicals the Government will come down on the plant with the wrath of the EPA behind them if anything that doesn't belong gets into the ground.

To my knowledge there's only 2 undercoatings available...oil based & whatever Fluid-Film is. Both drip for some amount of time after application and they recommend spirited dusty back road driving for a while to keep it 'stuck' to the car.
The rubberized spray on undercoating just rots out the frame 10x faster than a saltwater bath every winter.

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Old 01-08-2020, 08:01 AM   #11
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Default Re: Undercoating

Quote:
Originally Posted by fetchitfido View Post
They don't care what it is, we use enough harsh, environment killing, chemicals the Government will come down on the plant with the wrath of the EPA behind them if anything that doesn't belong gets into the ground.

To my knowledge there's only 2 undercoatings available...oil based & whatever Fluid-Film is. Both drip for some amount of time after application and they recommend spirited dusty back road driving for a while to keep it 'stuck' to the car.
The rubberized spray on undercoating just rots out the frame 10x faster than a saltwater bath every winter.
It sounds like you have the oily stuff more available in your area (are you in Canada?) and that's what you primarily think of as undercoating. The stuff I'm talking about, is asphalt, or "rubberized" and won't drip anymore than the paint on your car.

...
2000 SL2 Automatic (back on the road) 17X,XXX miles.
1999 Chevy K3500

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Old 01-08-2020, 08:42 AM   #12
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Default Re: Undercoating

Quote:
Originally Posted by onlinebiker View Post
I experimented trying to take it off with a pneumatic needle scaler. Whatta mess....

The problem is - it hides critical rust and makes it a mess to attempt fixing.

I would rather just not having it.
I've never used a needle scaler, but isn't that going to damage the paint underneath and then promote rust? It seems to me that if it's stuck on well it's better left alone. Just keep it sprayed with Fluid Film, or scrape off damaged areas and respray with a decent undercoating out of a spray can.... something purchased from a body shop supply house.

If you need to remove small areas of the stuff, I'd recommend something with a high concentration of d-limonene.... not the "orange degreasers" available on the retail market as those have a very low percentage. You need the expensive stuff. I stripped the inside of a van floor with it once, but even that was probably auto parts store grade, not the super heavy stuff I've seen on some vehicles. I sprayed it on, let it sit and then pressure washed it.... I then wire wheeled a lot too, but rust was also involved. The wire wheel would kinda spread the bits of undercoating that was left.

...
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Old 01-08-2020, 12:10 PM   #13
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Default Re: Undercoating

I was seeing if I could get the mess off so I could weld in new metal. Removing the paint is a moot point. If you don't scrape it - you burn it off when welding.

...
92 SC2
93 SC2
96 SC2
97 SL2
97 SC2
99 SC2
01 SC2 x 2 yellow
02 SC2
02 SL2
parts
2 94 SC2 parted out
2 96 SC2
98 SC2 - rusty frame minus engine.

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Old 01-08-2020, 04:24 PM   #14
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1997 SW2
Default Re: Undercoating

Quote:
Originally Posted by fetchitfido View Post
They don't care what it is, we use enough harsh, environment killing, chemicals the Government will come down on the plant with the wrath of the EPA behind them if anything that doesn't belong gets into the ground.

To my knowledge there's only 2 undercoatings available...oil based & whatever Fluid-Film is. Both drip for some amount of time after application and they recommend spirited dusty back road driving for a while to keep it 'stuck' to the car.
The rubberized spray on undercoating just rots out the frame 10x faster than a saltwater bath every winter.
The FluidFilm stuff is Lanolin-based -- basically, wool wax or wool grease from sheep. I didn't know it drips off, but it's pretty benign stuff compared to other undercoatings. Also, I don't think FF traps salts and water as other treatments do.

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Old 01-08-2020, 07:12 PM   #15
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Default Re: Undercoating

I've been using Fluid Film for years on my cars and it doesn't drip unless you really pile it on in one area. It's way too thick.

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Old 01-08-2020, 08:26 PM   #16
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Default Re: Undercoating

Quote:
Originally Posted by onlinebiker View Post
I was seeing if I could get the mess off so I could weld in new metal. Removing the paint is a moot point. If you don't scrape it - you burn it off when welding.
Ok I understand now.... you are looking at a specific repair, not just thinking about future possibility.

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Old 01-08-2020, 08:59 PM   #17
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Default Re: Undercoating

A gasket scraper seems to work the best ...for the areas you are able to reach with a gasket scraper. They can be re-sharpened with a file. So, they work as a rust scraper if you use them along with a hammer.

I de-undercoated a car by making a very, very shallow swimming pool under it using big scraps of landfill liner. So, if you’re not some poor goober standing around doing nothing but watching landfill construction, you probably won’t have big car-sized scraps of landfill liner. Try heavy Visqueen**

As far as applying undercoating, use POR15 if you are able. If not, use undercoating. The rubberized stuff is for sound-deadening, or to be applied over the top of something that actually prevents rust. I think most people use the rubberized stuff because they think wheel wells should be black (appearance only). ...but I could be wrong.

**Visqueen is a brand of polyethylene plastic sheeting (typically low-density polyethylene) produced by British Polythene Industries Limited. It is the registered trade mark of British Polythene Limited in numerous countries throughout the world.

...
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Old 01-08-2020, 09:02 PM   #18
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Default Re: Undercoating

Gosh! I feel left out. My car has no rust or need for an undercoating.

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Old 01-12-2020, 12:55 PM   #19
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Default Re: Undercoating

Quote:
Originally Posted by Macgyver View Post
I've been using Fluid Film for years on my cars and it doesn't drip unless you really pile it on in one area. It's way too thick.
How often do you reapply FF? What about areas that are already rusted?

Mostly I am bumping older threads to move the spam down

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