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What's the best way to remove old undercoating?
Posted by: Willt65 ()
Date: February 24, 2012 06:44PM

My 65 corsa has the old original undercoating that's rock hard and cracked at all the seams, where it has allowed rust to creep in and do it's thing. The only way that I have come up with to successfully remove it is to heat it with a propane torch and then scrape it with a putty knife. Is there an easier more efficient way out there?confused smiley Hope somebody has come up with a better solution!

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Re: What's the best way to remove old undercoating?
Posted by: gmgmtl ()
Date: February 24, 2012 06:59PM

The only easier way is to have someone else do it with torch and a knife. Sandblasting has little effect.
GMoore

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Re: What's the best way to remove old undercoating?
Posted by: dansk ()
Date: February 24, 2012 07:13PM

Like Gary said, spatchula and heat. I bought a high powered heat gun when I did mine. It's still a slow process no matter what you do. Chemicals won't work, just elbow grease, time and patience. Once the majority is off, still more work if you want to get it to metal. If not, just get rid of all you can and reseal. No matter what, it's a dirty job. Get a kid under there and help ya out.
Dann

Dann
So. Calif.
Granada Hills
Daily drivers
1996 Ford E350 Powerstroke diesel
2017 Volkwagen Jetta
Fun cars
1965 Corsa Turbo (currently undergoing total restoration)
1994 Dodge Viper RT10
1996 Dodge Viper GTS
1998 Dodge Viper GT2

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Re: What's the best way to remove old undercoating?
Posted by: solo2r ()
Date: February 24, 2012 07:14PM

Have fun! No, seriously!thumbs up

Attachments:

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Re: What's the best way to remove old undercoating?
Posted by: gmgmtl ()
Date: February 24, 2012 07:24PM

Don't let hot crud fall on exposed skin, ventilation is important and be prepared to put out a fire. Old mouse houses go up quick.
GMoore

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Re: What's the best way to remove old undercoating?
Posted by: Willt65 ()
Date: February 24, 2012 07:25PM

Thanks, I guess I just need to suck it up and start back at it! Thought maybe someone might just have an idea I never came up with. What's the car hobby montra I just read hear on another link? I'm having fun! I'm having fun!grinning smiley

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Re: What's the best way to remove old undercoating?
Posted by: Brizo ()
Date: February 24, 2012 09:00PM

If its worth it to you and your having fun,great, but I've never seen any good reason to remove all the old undercoat. Its certainly not going to fall off is it? If metal repair is needed, why not just remove the old undercoat in the immediate repair area and then recoat it, blending into the old material. Then give a thin "color coat"to all the rest. Think of all the really important work you could be accomplishing elswhere on the car with all that time and labor. JMO

Dan Brizendine, Circle City Corvairs
'64 8 door Greenbrier, +.060, stroked 186 ci.140 PG. "In beautiful Wanamaker Indiana...with one stop light and 5 pizza shops"

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Re: What's the best way to remove old undercoating?
Posted by: lgoodwin ()
Date: February 24, 2012 10:06PM

I second Dan's suggestion to only remove as needed. The old stuff was asphalt based and is usually pretty easy to get off. The newer rubberized stuff is much harder to remove. While you're doing it, you may as well scrape off all undercoating that is loose or has too many layers built up.

Instead of a putty knife, use a painter's tool. They work better and are easier to clean off. Set your heat gun to the LOW setting (mine's permanently wired to only run on low to prevent the lead in old paint from vaporizing). With most paints, you have to let the painters tool cool and use another tool to scrape the paint off, repeating VERY OFTEN. Otherwise, the paint will build up on it and the melted paint will just get dragged around. I use 2 or 3 tools and rotate them while I work. The only efficient/safe ways to remove a lot of undercoating are on a rotisserie or on a lift. With a rotisserie, you can position the car so that the gunk does not fall on you. With a lift, I'd wear a full face shield and a hat with a bill to protect your eyes.

<table align='center' width='0'>
<tr>
<td><img src='[www.automation-scs.com]; alt='1962 Corvair 900 sedan' width='190' /></td>
<td><img src='[corvaircenter.com]; alt='1967 Corvair Monza 140/4-speed' width='190' /></td>
<td><img src='[corvaircenter.com]; alt='1968 Corvair 500 coupe' width='190' /></td>
<td><img src='[www.automation-scs.com]; alt='1983 Mexican Mustang 5.0' width='190' /></td>
<td><a href='[www.automation-scs.com&]; target='_blank'></a></td>
</tr>
<tr>
<td align='center'><font size='1'>1962 900 sedan needs a home</font></td>
<td align='center'><font size='1'>1967 Monza 140/4-spd</font></td>
<td align='center'><font size='1'>1968 500 coupe (now my son's)</font></td>
<td align='center'><font size='1'>1983 Mexican Mustang 5.0</font></td>
</tr>
</table>

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Re: What's the best way to remove old undercoating?
Posted by: brentc ()
Date: February 24, 2012 10:20PM

The factory stuff is also asbestos based according to GM- use care not to grind it off or do anything that makes dust, and use care to have a mask or whatever measures are indicated to prevent breathing it in-

Brent

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Re: What's the best way to remove old undercoating?
Posted by: lgoodwin ()
Date: February 24, 2012 11:17PM

brentc Wrote:
-------------------------------------------------------
> The factory stuff is also asbestos based according
> to GM- use care not to grind it off or do anything
> that makes dust, and use care to have a mask or
> whatever measures are indicated to prevent
> breathing it in-
>
> Brent

Asbestos? Seriously? Was it used as a fire retardant, binder OR convenient way to dispose of waste brake lining material? Remember Steve McQueen!

<table align='center' width='0'>
<tr>
<td><img src='[www.automation-scs.com]; alt='1962 Corvair 900 sedan' width='190' /></td>
<td><img src='[corvaircenter.com]; alt='1967 Corvair Monza 140/4-speed' width='190' /></td>
<td><img src='[corvaircenter.com]; alt='1968 Corvair 500 coupe' width='190' /></td>
<td><img src='[www.automation-scs.com]; alt='1983 Mexican Mustang 5.0' width='190' /></td>
<td><a href='[www.automation-scs.com&]; target='_blank'></a></td>
</tr>
<tr>
<td align='center'><font size='1'>1962 900 sedan needs a home</font></td>
<td align='center'><font size='1'>1967 Monza 140/4-spd</font></td>
<td align='center'><font size='1'>1968 500 coupe (now my son's)</font></td>
<td align='center'><font size='1'>1983 Mexican Mustang 5.0</font></td>
</tr>
</table>

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Re: What's the best way to remove old undercoating?
Posted by: jimmyo ()
Date: February 25, 2012 02:16AM

I was using acetone/atf mix to losen some rusty bolts and I noticed it desolved the undercoating as well. I haven't tried it over a larger area, but I might.

Jim O'Connor
45 miles north of The Bronx, N.Y.
1962 Greenbrier 110 4spd
1964 Monza Convertible 110 PG
"Wherever you go....There you are"

<a href="[s1166.photobucket.com]; target="_blank"><img src="[i1166.photobucket.com]; border="0" alt=" photo 045ef0c8-2087-4eac-8a5d-9aa0d575d5e0_zps9946d378.jpg"/></a>
<a href="[s1166.photobucket.com]; target="_blank"><img src="[i1166.photobucket.com]; border="0" alt=" photo e1227532-1d1b-4c27-b9b3-ab7c1e338ee9_zpsoelhfofz.jpg"/></a>

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Re: What's the best way to remove old undercoating?
Posted by: ken ()
Date: February 25, 2012 05:10AM

I remember reading ( long time ago ) that oven cleaner works.

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Re: What's the best way to remove old undercoating?
Posted by: GWLee ()
Date: February 25, 2012 05:35AM

[www.harborfreight.com]

I bought the compact scaler for this very reason. I used the heat gun and scraper on one of the wheel weels and it takes a lot of time.

I bought this tool about a month ago and only used it a little on one wheel well and it knocked the undercoating off very easily.

It chips away until only a little is left and then I can hit it with a scarper to smooth out the rest. It also allows me to reach areas I can't reach with a scrapper. In corners and places like that.

It may be a flop when I get too the job and try to do the rest, but the area I did it knocked the stuff off pronto. I only tried it on an area about 4 in x 6-8 in, and it cleaned it off in about a minute or less.

The old coating, as has been said, is hard and it takes a lot of heat to soften.

Just wear some hearing protection and glasses for your eyes because it will come off in all angles, all over you. I also wear a dust mask.

The tool is only 20.00 bucks, so I haven't lost much if it does not work. But any it gets is less that you have to heat and scrap, plus the awful smell of the undercoating cooking under heat.

I am lazy by choice, now that I have retired, and I didn't want to spend a week in the wheel wells doing this.

Just experiment on the angle of the tool. Straight on didn't work as well as laying the tool at a angle, like you would your scrapper, which gave me the best results.

Good luck

Lee Adkins

A Cave Man car
1960 2dr Coupe with pg
Color Tasco Turq.
With Ermine white top.

Catlettsburg,
In the Beautiful state of
North/East KY!

Not the best pic, but the only I had from then, 1997!

[



Edited 1 time(s). Last edit at 02/25/2012 05:43AM by GWLee.

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Re: What's the best way to remove old undercoating?
Posted by: blackspyder ()
Date: February 25, 2012 11:29AM

I have used this, it really works well

[www.eastwood.com]

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Re: What's the best way to remove old undercoating?
Posted by: slow61 ()
Date: February 25, 2012 03:34PM

One of the negative reviews of that eastwood stripper blackspyder linked says its junk, but "I used some Aircraft stripper. The undercoating came off with a little pressure on the paint brush I was using to apply it. All wheel wells are clean using the stripper"

So according to that guy, the aircraft stripper is the ticket.

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Re: What's the best way to remove old undercoating?
Posted by: Willt65 ()
Date: February 25, 2012 03:42PM

Hey Thanks for all of the input! I'll got several good ideas, I'll try them out soon. Again Thanks!

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Re: What's the best way to remove old undercoating?
Posted by: SSpeed66 ()
Date: February 25, 2012 07:58PM

brentc Wrote:
-------------------------------------------------------
> The factory stuff is also asbestos based according
> to GM- use care not to grind it off or do anything
> that makes dust, and use care to have a mask or
> whatever measures are indicated to prevent
> breathing it in-
>
> Brent


Well, it seems I better get my ass in gear & get my car done, as it won't be long now before I won't be able to use it...eye popping smiley

Al Macaulay - Okanagan Valley, BC
Western Canada Corsa

Link to my Corsa build- [corvaircenter.com]
Link to my Cobra boat Project- [www.sidewinder-boats.com]

66 Corsa 140 HT - 402BBC/Turbo 425, 66 CDN Corsa 'Vert 140, 79 Cobra 16SS/Merc 1500, 69 Triumph Trident Chopper, 67 BSA Lightning Custom
Cobra Custom Metal Design/ God Bless Canada

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Re: What's the best way to remove old undercoating?
Posted by: lgoodwin ()
Date: February 25, 2012 08:38PM

For curved surfaces, you can grind a scraper to have the same profile at the curve. This will speed up the scraping process significantly.

<table align='center' width='0'>
<tr>
<td><img src='[www.automation-scs.com]; alt='1962 Corvair 900 sedan' width='190' /></td>
<td><img src='[corvaircenter.com]; alt='1967 Corvair Monza 140/4-speed' width='190' /></td>
<td><img src='[corvaircenter.com]; alt='1968 Corvair 500 coupe' width='190' /></td>
<td><img src='[www.automation-scs.com]; alt='1983 Mexican Mustang 5.0' width='190' /></td>
<td><a href='[www.automation-scs.com&]; target='_blank'></a></td>
</tr>
<tr>
<td align='center'><font size='1'>1962 900 sedan needs a home</font></td>
<td align='center'><font size='1'>1967 Monza 140/4-spd</font></td>
<td align='center'><font size='1'>1968 500 coupe (now my son's)</font></td>
<td align='center'><font size='1'>1983 Mexican Mustang 5.0</font></td>
</tr>
</table>

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Re: What's the best way to remove old undercoating?
Posted by: upnorth1 ()
Date: February 26, 2012 09:06AM

I used aircraft stripper on my truck. then realized it would be faster and less costly to have it sandblasted. Used Black Diamond grit.

bob

Chaplain Bob
135 miles from Canada

AT THE TIP OF LAKE SUPERIOR
1961 Loadside 95hp. 30 over bored and stroked. 145 block, 165 heads 4 speed
1966 Corsa clone 140 4 speed, 30 over.
1966 4 door 110 pg soon to return to factory 140 PG

DON'T mess with Old Men, we didn't get old by being, STUPID!!!

\/ this is a half mile from my house... \/

<a href="[www.wunderground.com] src="[weathersticker.wunderground.com]; alt="Click for Hermantown, Minnesota Forecast" height="90" width="160" /></a>

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Re: What's the best way to remove old undercoating?
Posted by: 52bagman ()
Date: February 26, 2012 10:58AM

GWLee that is what us towboaters use to strip a boat. Works good on them, don't know about using on the thinner sheet metal of a car tho. I have thought about it. I have a fornt clip that needs stripped underneath, may try one out on it.

Sam C. Saunders,Pt. Pleasant WV
68 500 cp 95 pg ash gold
66 Monza cp 110 4spd black
68 500 cp 95 3spd blue "DAIRY QUEEN CAR"

<a href="[s930.photobucket.com]; target="_blank"><img src="[i930.photobucket.com]; border="0" alt="1 link"></a><a href="[s930.photobucket.com]; target="_blank"><img src="[i930.photobucket.com]; border="0" alt="2 link"></a><a href="[s930.photobucket.com]; target="_blank"><img src="[i930.photobucket.com]; border="0" alt="Photobucket"></a>

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