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  #13  
Old 02-07-2014, 06:59 PM
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Re: Underbody Coating

They have to drill holes to do the undercoating so saying it can trap moisture is proposterous.
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  #14  
Old 02-07-2014, 07:42 PM
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Re: Underbody Coating

Quote:
Originally Posted by jgc4ever View Post
They have to drill holes to do the undercoating so saying it can trap moisture is proposterous.
It will trap moisture if the area is wet or super humid. But unless you washed it then instantly sprayed it your good to go.

Under Car Coatings - Paints & Coatings

I thought about finding a Linex shop or Armorthane or a Ziebart

and having them do the WK2 but there is alot of aluminum underneath these's beast so it's hard to really tell how much benefit.
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Old 02-07-2014, 07:53 PM
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Re: Underbody Coating

Waste of money.
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Old 02-07-2014, 09:50 PM
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Re: Underbody Coating

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Originally Posted by jgc4ever View Post
They have to drill holes to do the undercoating so saying it can trap moisture is proposterous.
I don't think you get it. Anyplace it isn't fully adhering is a place where moisture can get in if there is an available opening and then be wicked quite a ways where it will be trapped until such time as it can evaporate. This can be a long time when there is next to no air movement. This isn't uncommon with coatings of any type. Further the hole drilling is just another potential problem with using these coatings because you have created another entry for corrosion which if not properly sealed will itself become a point of corrosion development. About the last thing I would be expecting at a dealership is to get well prepped surfaces and attention to details such as those holes.

I hate to throw in real world experience but I've been under a lot of cars and seen a lot of undercoatings and never seen one that had any apparent prep. They sprayed over dirt, grease, oil, everything. In some cases it was coming off wholesale and yes, in some cases it had trapped water underneath it where there was corrosion that exceeded that on the area next to it where it fell off. You really sure you want to go with preposterous?
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Old 02-07-2014, 10:53 PM
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Re: Underbody Coating

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Originally Posted by crabman View Post
I don't think you get it. Anyplace it isn't fully adhering is a place where moisture can get in if there is an available opening and then be wicked quite a ways where it will be trapped until such time as it can evaporate. This can be a long time when there is next to no air movement. This isn't uncommon with coatings of any type. Further the hole drilling is just another potential problem with using these coatings because you have created another entry for corrosion which if not properly sealed will itself become a point of corrosion development. About the last thing I would be expecting at a dealership is to get well prepped surfaces and attention to details such as those holes.

I hate to throw in real world experience but I've been under a lot of cars and seen a lot of undercoatings and never seen one that had any apparent prep. They sprayed over dirt, grease, oil, everything. In some cases it was coming off wholesale and yes, in some cases it had trapped water underneath it where there was corrosion that exceeded that on the area next to it where it fell off. You really sure you want to go with preposterous?
I take it back. And apologize for not being knowledgeable about this.

I did have a 98 Grand Cherokee (bought new) that I didn't have undercoated that I kept for 7 1/2 years and it started to rust. My parents have a 2004 Grand Cherokee (bought new) that was undercoated and no rust has formed. I had my 2012 undercoated. Obviously this doesn't affect what you're saying. And it's certainly not statistically relevant with such a small sample.

The undercoating I got did come with a warranty too. And just not having surface rust when I look under my Jeep makes me happy I had it done, plus the potential protection in future years.
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Old 02-07-2014, 11:32 PM
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Re: Underbody Coating

Dont get me wrong, I think the coating cant hurt and probably helps when done correctly by someone who knows how that takes the time to properly prep the surfaces. I once had a boat trailer covered in its entirety with line-X that held up with nary a problem for more than 10 years but it was done by a private shop owner who actually cared about his work. This doesn't describe most dealer undercoating spray operations which are typically just a racket. I don't have a beef with the coatings themselves, its the shoddy workmanship that causes problems IMO.
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Old 02-08-2014, 09:00 PM
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Re: Underbody Coating

I investigated this as well. My understanding is that the underbody parts are coated from the factory, which is something that wasn't being done in the old days. As such, some argue that undercoatings are useless because parts are coated from the factory.

There are two basic type of undercoating.

The first is the type that creates a hard coating and forms a barrier or shell. This undercoating, when done wrong, will clog drain holes or not adhere properly, creating areas where water will sit and cause your car to actually rust faster. It's important for this type of undercoating to be applied by professionals who know exactly where your car's drain holes are (to mask them during spraying) and who apply the undercoating when the vehicle is bone dry and in a warm dry environment. It's important that there is no moisture to cause adhering problems.

The second type is oil based undercoating. Some argue that these are the way to go because they remain a liquid, repel water, and eventually wash away. That way if it gets into a drain hole it's a lot less likely to clog it. But you have to re-apply them yearly.

I didn't undercoat my last car, a 2003 Murano, and it lasted 10 years. It had a rusted sub frame piece that needed replacement and most of the original control arm bolts were frozen with rust, but the frame itself was fine. I also rarely washed it during the winter so it sat coated with salt for much of the winter.

For the Jeep, I decided that I would go with the relatively simple strategy of washing the Jeep once a week, during the winter months, using a touch-less car wash.
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Old 02-09-2014, 11:34 AM
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Re: Underbody Coating

and this is why it's really up to you. Do all the research you want and it'll still say exactly what it says in this thread. Nobody can prove for sure either way. I've had cars with it and cars without. They all look about the same to me after. The last two the car without looked better than the car with so the Jeep doesn't have it.
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  #21  
Old 02-09-2014, 08:41 PM
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Most dealers are going to use a cheap knock off undercoating from what I have seen. If you find the right place to do your undercoating the vehicle will last for years and years. The place my whole family has went to for years charges $395 and if you pay $15 in another year for a touchup they will guarantee the vehicle will never rust or your money back. We have never had any vehicle rust that has been undercoated, which has been over over 15 so far ranging in model years from 1984 to 2013. Most of them are from the late 90's and show zero rust.
It also matters where you live, in michigan where salt is on the road 4 months every year it really matters.
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