Re: Undercoating for wheel wells, etc.

From: 52m37@charter.net
Date: Sun Oct 09 2005 - 20:29:35 PDT


I read on this forum, or another, about a product that NAPA has called 'rock
guard' (I think that was it). I have not used it but perhaps someone who has
could comment.
Hal

> From: Chris Brunner <cjbrunner@optonline.net>
> Date: Sun, 09 Oct 2005 23:00:14 -0400
> To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
> Subject: Re: [MV] Undercoating for wheel wells, etc.
>
> I have bought two different types of compounds from either JC whitney or
> Edmonds (I think that's the name of it - if anyone is really interested
> I'm sure I can find the details). One was the typical spray on compound
> that dried out and hardened. The other was a compound that worked like
> vasoline - went on wet and stayed that way - it was considered to be
> "self healing". Although I'd hate to try and clean up the self healing
> - seemed to be a good idea. The mud and crud that embedded in it from
> the wheel wells seemed to absord the jelly and turn into one giant oil
> based goo that kept water off.
>
> Chris
>
> MV wrote:
>
>>
>> Keeping metal from rusting can be viewed two different ways (perhaps
>> more). You need to keep water and oxygen from the surface of the
>> metal. When both of those things are present steel and iron will rust.
>>
>> If you have rocks and dirt hitting the surface also, the coating has
>> to have some type of surface that will resist abrasion. The heavy
>> mastic type coating, like roof cement or roof coating can do that.
>> The problem comes in if water and air get behind that stuff. Then
>> that type of coating can cause rust to actually accelerate. Wheel
>> wheels is a tough problem. That's why a lot of car makers now use
>> plastic to line wheel wheels.
>>
>> If you don't have an abrasive environment like the wheel well
>> locations, the best thing to use is a rust preventative coating that
>> is similar to the stuff that Ziebart uses. They have an inner panel
>> grade that is pretty runny, and a slightly heavier grade that works
>> well on exterior underbody stuff. The military uses at least two
>> grades also on their trucks also.
>>
>> Daubert Chemical makes a huge number of different rustproofing
>> compounds (including a number of military grade compounds) and but I
>> have had some difficulty getting a decent supplier to sell me the
>> stuff in smaller quantities. (Like 5 gallon cans) JC Whitney sells
>> some decent stuff that I believe is Daubert compounds put into smaller
>> bottles that fit their applicator tool set.
>>
>> Compared to auto paint the stuff is pretty cheap and it works. Highly
>> recommended if you are trying to prevent rust.
>>
>> Dave
>>
>>
>>
>> Everette wrote:
>>
>>> There used to be shops that could spray undercoating on as an
>>> aftermarket application, they used a large spray gun much like a pant
>>> sprayer, drew coating out of drum and sprayed on underside of
>>> vehicle. Nasty job to do, have to wear disposable coveralls, hood
>>> over head with outside air source.
>>>
>>> Give this some thought when applying have coatings as "bed liners"
>>> etc. I spent many years in the fertilizer business where rust and
>>> corrosion is a tremendous problem. We found that if we put a heavy
>>> coat of undercoating or similar materials on truck beds, wheelwells
>>> etc.it greatly magnified the rust problem, coating would get small
>>> hole in it, let water in and the metal would rust away behind the
>>> coating. Be aware that the use of these trucks far exceeds what an
>>> individual would subject the vehicle to in most cases.
>>>
>>> Slip in bedliners will wear paint off truck beds also exposing bare
>>> metal to rust.
>>>
>>> We had best results with the heavy flexible plastic / rubber mats
>>> that lay flat in floor, -IF- once in a while we would take them out
>>> and wash trash out of truck bed.
>>>
>>> On the same thread we quit specifying heavy duty frames on trucks if
>>> heavy frame was made by bolding or riveting two pieces of frame metal
>>> together for rust would get between them and force them apart
>>> breaking them.
>>>
>>> ----- Original Message ----- From: "Dick" <rertman@ix.netcom.com>
>>> To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
>>> Sent: Friday, October 07, 2005 12:25 PM
>>> Subject: Re: [MV] Undercoating for wheel wells, etc.
>>>
>>>
>>>> Stu and gang:
>>>>
>>>> IMHO, the best stuff is that spray-on liner for pickup truck beds.
>>>> I had
>>>> mine done at
>>>> a local Line-X shop. I had them leave out the non-skid stuff and the
>>>> finished product
>>>> looks great and protects like crazy. It's washable, too.
>>>>
>>>> My 2 cents worth.
>>>>
>>>> Dick
>>>>
>>>> ----- Original Message ----- From: "Stu" <stuinnh@mvnut.us>
>>>> To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
>>>> Sent: 07 October, 2005 09:11
>>>> Subject: [MV] Undercoating for wheel wells, etc.
>>>>
>>>>
>>>> Hi all!
>>>> What type of brushed on undercoating do I see on CUCV's? It looks like
>>>> roofing cement? I need to do redo mine.
>>>> Thanx as always for everyone's help again.
>>>>
>>>> "Stu"
>>>> Southern NH, USA
>>>> "Live Free Or Die"
>>>>
>>>> MVPA #14790
>>>> 1967 M151A1 Jeep 1964 M416 Trailer
>>>> 1985 M1008 CUCV Pickup
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
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>>>
>>>
>>>
>>>
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>>
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>
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