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Old Jul 6, 2011 | 11:50 PM
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Default having car undercoated?

Has anyone tried a company like this?

http://linexoftulsa.com/index.php?op...id=5&Itemid=65


I have no rust issue and and would like to keep it that way, would this affect ncrs status? for the frame and other parts, I know the car body is fiber glass and it would get over sprayed

Would like to see what you all think before I drive over and wast my time.

Last edited by THefley; Jul 7, 2011 at 12:01 AM.
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Old Jul 7, 2011 | 05:01 AM
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Originally Posted by THefley
I have no rust issue and and would like to keep it that way, would this affect ncrs status? for the frame and other parts, I know the car body is fiber glass and it would get over sprayed.
I know many an owner that have cussed previous owners who had their dealer undercoat a Corvette. This is on the NCRS judging field, undercoating distorts the ability of a judge to look at finishes on just about every chassis item from frame to a-arms, steering, underbody, exhaust, drive shaft, half-shaft, struts, etc. Undercoating will prevent an owner from achieving a higher "Top Flight" award.

We looked at a 78 at Bloomington that was very nice topside, but the underside was heavily undercoated...I mean heavily. Owner had no clue. Yeah it was preserved but the first thing that owner will do is get underneath and attempt to clean it off which will take a long time. And in the process destroy original finishes along with factory markings. Undercoating is a no win for an owner on the judging field. My suggestion is to search for an alternative.
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Old Jul 7, 2011 | 08:06 AM
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I understand the aspects of keeping the car as original as possible for show judging. On the other hand, all of us here on the CF have read numerous discussions on rusted frames and especially on rusted "birdcages". It's a balancing act.

If I had a C-3, and it was indeed rust free, and I wasn't worried about show judges, I'd use a product called LPS 3. It's a rust preventive liquid that can be sprayed or brushed on in a light coat, gives good corrosion resistance, but if absolutely necessary, can be easily removed with a solvent.
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Old Jul 7, 2011 | 08:15 AM
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it depends on what you are doing with it. I have a '77 that I use as a driver. Not the original engine and not a numbers matching car. In that case, I chose to undercoat it myself. I used Herculiner (however you spell it). It is a brush on or spray on product that is available at almost any auto parts. I was doing a body-off at the time. It made the car somewhat quieter to drive. I also used it inside the car. It sealed it up nice and tight. I even sealed up the insides of the door skins. It also makes it easier to heat and cool as there is no air coming in anywhere.
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Old Jul 7, 2011 | 08:16 AM
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The past owner was a member or the ncrs and kept the car to spec. It's an 81 so it is not rare and I don't really plan to show it at any ncrs shows.

But I drive it all the time and here in Oklahoma we put down salt and sand down in the winter. Just looking for ways to preserve the underside. Just minor surface rust on some parts like springs, swing arm and such.
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Old Jul 7, 2011 | 09:29 AM
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Originally Posted by THefley
The past owner was a member or the ncrs and kept the car to spec. It's an 81 so it is not rare and I don't really plan to show it at any ncrs shows.

But I drive it all the time and here in Oklahoma we put down salt and sand down in the winter. Just looking for ways to preserve the underside. Just minor surface rust on some parts like springs, swing arm and such.

I live in New England, so ya don't need to tell me about salt, brother! I have found that the most effective way to keep salt from rusting your car is to not let any salt get on your car by not driving it when there is salt on the roads. Call me a smart-*** if you want, but it is a true statement.


Scott
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Old Jul 7, 2011 | 10:03 AM
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When someone has me look at a C3, that they are interested in purchasing, I always steer them away from cars with an undercoated frame . The main reason for this is that it hides any rust and repair issues with the frame. You just don't know what is under it. Just my $.02.
I had a friend die because someone used Bondo to repair holes in a frame and made it look real nice.
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Old Jul 7, 2011 | 11:01 AM
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Unless you drive the car in winter or do a lot of driving in rain, I doubt that you need undercoating in Oklahoma. But, if you want to protect the metal parts under the car, just use a good quality frame paint...heck, Rustoleum semi-gloss black will do the job if you get the grease/dirt off the metal first.
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Old Jul 7, 2011 | 11:24 AM
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Originally Posted by 7T1vette
Unless you drive the car in winter or do a lot of driving in rain, I doubt that you need undercoating in Oklahoma. But, if you want to protect the metal parts under the car, just use a good quality frame paint...heck, Rustoleum semi-gloss black will do the job if you get the grease/dirt off the metal first.
True, but you can't get into the "nooks and crannies" with paint. That's why I recommend spraying LPS 3 in those areas. (I live in the snow belt, and used to rustproof cars for extra $$$)


Originally Posted by scottyp99
I live in New England, so ya don't need to tell me about salt, brother! I have found that the most effective way to keep salt from rusting your car is to not let any salt get on your car by not driving it when there is salt on the roads. Call me a smart-*** if you want, but it is a true statement.


Scott




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Old Jul 7, 2011 | 01:43 PM
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If that spray stuff is a 'rust converter' which would cause any hidden rust to convert to an inert material, that would be of benefit. But, not sure how you get the grease and dirt out from 'hidden' areas first?
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Old Jul 7, 2011 | 03:59 PM
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Originally Posted by THefley
...would this affect ncrs status?...
Can't say about "status", but aftermarket undercoating will cost you points if you have the car judged.

Your car left the factory with sound deadener/undercoating on the underbody. AIM shows it.


Last edited by Easy Mike; Jul 7, 2011 at 04:02 PM.
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Old Jul 7, 2011 | 05:40 PM
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I am to that point and have chosen the paint mode. I live in Maryland so I am part of the salt belt. There is a LOT of pleasure in fall and early winter driving until the first salt gets applied, then it's not driven until well after a good rain to wash it away!

Rules: Never drive in rain / salt / snow. Never undercoat as it's not needed.

My .02 ...
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Old Jul 7, 2011 | 06:35 PM
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Nnnnoooooooooooo!
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Old Jul 7, 2011 | 10:11 PM
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Originally Posted by THefley
Has anyone tried a company like this?

http://linexoftulsa.com/index.php?op...id=5&Itemid=65


I have no rust issue and and would like to keep it that way, would this affect ncrs status? for the frame and other parts, I know the car body is fiber glass and it would get over sprayed

Would like to see what you all think before I drive over and wast my time.
UNDERCOATING ???

W H Y ? ? ?
planning on leaving it out in the rain & snow,
or using it as a daily driver in Vermont in the salt & mud ?????
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Old Jul 8, 2011 | 09:08 AM
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Originally Posted by 7T1vette
If that spray stuff is a 'rust converter' which would cause any hidden rust to convert to an inert material, that would be of benefit. But, not sure how you get the grease and dirt out from 'hidden' areas first?
If you're referring to the LPS3 I mentioned, no it's not a "rust converter" type of product. It's a rust preventive product. You'd get the dirt and grime out by pressure washing.
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Old Jul 8, 2011 | 06:30 PM
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Originally Posted by rdroe
...Rules: Never drive in rain / salt / snow....
You're not using your C3 as a daily driver. My 74 was my daily driver and she survived everything on your list.

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Old Jul 8, 2011 | 09:36 PM
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Undercoating wont hurt NCRS judging, will totally kiil it. No judge will even go near the thing. As mentioned, why if not driving that much. If you've already done it, good luck removing that gook, as usually in the doors and other inner panels.
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Old Jul 8, 2011 | 09:52 PM
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Originally Posted by Vette5.5
Undercoating wont hurt NCRS judging, will totally kiil it. No judge will even go near the thing. As mentioned, why if not driving that much. If you've already done it, good luck removing that gook, as usually in the doors and other inner panels.
No I have not done it. That's why I asked here upfront! Even if or if it isn't what I wanted to hear

I know I will get a straight answer and an alternative to what i was asking.

So now it looks like I should finds something that would kill what surface rust I might have, clean it up and spray paint the underneath parts?
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Old Jul 9, 2011 | 11:32 AM
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Put it up on jack stands, get a good wire wheel on some type of angle grinder and have at it. It takes about an hour. Wear safety goggles and a mask. Then get a real good quality rattle can ... Rustolium makes a premium grade satin black and go over all the parts. Mine looks great. The gook ( grease, etc) came off with Brake Clean. The nice thing about it is that it really cuts the grease off and then evaporates away, leaving a beautiful piece of raw material.

This is what I do, and am currently in the middle of, with my 82.

Have fun with it! I consider it a bonding experience.
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Old Jul 9, 2011 | 12:45 PM
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My 71 had factory undercoating on it.I have chipped some off jacking the car.Frame looks like its about 8 years old.0 rust.I wouldn't undercoat it now but I'm glad it was back when the car was driven every day.Out 6 cars I looked at this one looks as good as my 2002 tacoma underneath.
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