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Old 08-23-2007, 10:42 PM   #1
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Undercoating to slow rust

I need to protect the underbody on our '99 Sahara from further rusting before the snow flies. My mechanic, who also runs a body shop, can apply a paraffin-based spray which he says is good at getting in all the nooks/crannies.

Has anyone heard of this sort of thing? This is my son's DD, so it will be getting plenty of salt exposure this winter!

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Old 08-24-2007, 12:23 AM   #2
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My uncle says it works good, but no personal experience. Sorry I couldn't be more help.

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Old 08-24-2007, 09:52 AM   #3
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personally i would go the whole nine yards and sand it all down and then por-15 it
the paraffin spray is good, but remember it i sjust like a wax candle so it it gets hot it will melt off, if your gonna spray it you might as well use the oil when yopu change your oil, it wont melt, and it will resist as good as the paraffin stuff and be cheaper, although you may have to reapply it a little more often
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Old 08-24-2007, 10:30 AM   #4
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Can't you just get the undercoat spray and apply that? we don't salt here in Cali so harly anyone undercoats but we sell the stuff in a spray can or you can buy bulk and get a gun.

Maybe 3 cans @ 8-10 $ a can will cover the bottom of a TJ.
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Old 08-24-2007, 10:41 AM   #5
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Personally, I would repair the exisiting rust. Prepare the surface using 100 grit sandpaper or a little paint stripper stripper and get down to the bare metal surface. Clean the metal with a some thinner afterwards and then use a high quality etching primer to re-seal. Spray on a couple of coats of black paint and then hit it with some rubberized undercoating....done!
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Old 08-24-2007, 10:49 AM   #6
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if u do that use por-15, its the best stuff out there for that
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Old 08-24-2007, 10:53 AM   #7
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I have the paraffin based stuff your talking about and it pretty much sucks. When I bought the Jeep the previous owner had it sprayed on. It is probably my least favorite thing about my TJ. Sure it protects from rust but I can scrape that stuff off with my finger nail if I try hard enough. It will wear off and then you'll of wasted the $$. Just use a high quality bed liner. Id suggest Herculiner. I use that on all my other vehicles and its good stuff. That of por-15 as everyone else said. Both of those are good but deff. dont go witht he stuff your mechanic suggested. From experience I know theres better stuff out there.
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Old 08-24-2007, 11:41 AM   #8
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I never thought about herculiner that would be a helava tough ungercoat.
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Old 08-24-2007, 11:51 AM   #9
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Deffinatley. You wouldnt ever have to worry about rust either.
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Old 08-24-2007, 04:34 PM   #10
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Using roofing tar material will work great too. That stuff is cheap, you can just brush it on directly over anything including grease and it will stick for ever.
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Old 08-24-2007, 04:59 PM   #11
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Blkjp Does it dry or stay Gooey on my Toyota i had some gooey crap that i hated.
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Old 08-24-2007, 05:03 PM   #12
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Quote:
Originally Posted by MOz View Post
Personally, I would repair the exisiting rust. Prepare the surface using 100 grit sandpaper or a little paint stripper stripper and get down to the bare metal surface. Clean the metal with a some thinner afterwards and then use a high quality etching primer to re-seal. Spray on a couple of coats of black paint and then hit it with some rubberized undercoating....done!
Best advice in my opinion, repair the rust then coat it.

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Old 08-24-2007, 05:06 PM   #13
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Quote:
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Blkjp Does it dry or stay Gooey on my Toyota i had some gooey crap that i hated.
You ever seen the stuff they do flat roofs with? It gets pretty damn hard. Not like road tar that you would get on your car.
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Old 08-24-2007, 05:22 PM   #14
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Lev not a ? of getting the rust gone trying to figure out the best coating for the bady afterwords. B/C i think if you cover the rust it will continue to travel under the coating and eat away at everything almost unnoticed.
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Old 08-24-2007, 05:38 PM   #15
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Quote:
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Lev not a ? of getting the rust gone trying to figure out the best coating for the bady afterwords. B/C i think if you cover the rust it will continue to travel under the coating and eat away at everything almost unnoticed.
Well the reason why I mentioned it was the fact the thread title said

Quote:
Undercoating to slow rust
Iv personally been researching this Durabak liner that comes in a can.

I requested a sample and its pretty top notch. They use it for boats, bed liner, undercoating, interior ect ect.

Quote:
Durabak™ is excellent for coating the complete exterior of your off-road truck, jeep, or any 4 wheel vehicle. Its tough polyurethane finish will protect your 4X4 against branches, rocks, water or almost anything else that you will encounter while off-roading. Don't spend your hard earned money on coating jobs that get scratched up after just one weekend off-road trip... apply Durabak™ polyurethane coating and see for yourself how well your vehicle will hold up in harsh conditions! Durabak™ is available in 15 colors so your truck or jeep will look great before and after your trip.

Durabak™ is also great for jeep tubs, truck cabs just about any interior. Forget about carpeting mold and hard to clean interiors. With Durabak inside just hose it out and you're done. Don't worry about rust either, Durabak's polyurethane membrane bonds so tightly that it will protect your truck's interior from almost anything! And best of all, it's inexpensive... because you do it yourself.
Quote:
Durabak's specially formulated polyurethane non-skid protective coating offers excellent slip and fall protection while protecting boat surfaces against rust and other fresh-water or salt-water damage. Durabak™ gives you excellent traction when wet. Our unique formulation has resilient, specially treated rubber granules contained in a totally flexible polyurethane base resulting in the "give" & "comfort" that no other non-slip coating offers. That's why it works better than any other product on the market! Durabak™ is a one-part formulation with no mixing yet it's quick drying. Just apply it with a roller and watch it bond to metal, wood, fiberglass, concrete... you get the picture - it has hundreds of uses!

* Won't crack, chip or peel
* Resistant to saltwater, fuels and chemicals
* Available in a variety of colors

www.durabakcompany.com

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Old 08-25-2007, 08:45 PM   #16
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Thanks for all the suggestions- something more permanent than the paraffin would be best.

I was looking at this product, too:

http://www.magnetpaints.com/underbody.asp
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Old 08-25-2007, 08:47 PM   #17
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Thanks for all the suggestions- something more permanent than the paraffin would be best.

I was looking at this product, too:

http://www.magnetpaints.com/underbody.asp
How bad is your rust?

~Lev
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Old 08-25-2007, 09:11 PM   #18
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Well, the entire underbody is brown, and it's not from mud

It's bad enough that I'm sure another winter of salt would eat into it pretty good. They dump it on the roads up here...

We just got the vehicle in March- otherwise, the original owner did a good job of maintaining it.

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