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Old 03-07-2014, 01:54 PM
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Frame and underside anti-rust paint or coating?

Good thread in the YJ forum on corrosion problems (https://www.wranglerforum.com/f290/am...ml#post8835394).

Most JKs are probably too new to have big problems with rust (correct me if I'm wrong), but as I intend keeping mine forever I hope to avoid problems from the start. Wish I had known about the ~$1000 option for extra underside paint when I ordered it; apparently the Canadians go for this. Smart; I would have done that for sure.

I understand the JK body is largely galvanized, but galvanized steel will eventually rust, if the zinc gets used up. Doubt the frame is galvanized but hope I'm wrong on this.

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Originally Posted by 48willys View Post
<snip> I have a good coating of Fluid Film undercoating on everything and have removed the plastic wheel housing liners. The undercoat stays tacky and repels water and salt but needs to be reapplied periodically, and oozes out everywhere.
This is why I want to avoid oil or wax type undercoating, plus the stuff attracts crud. At the same time, having crawled underneath and had a good look, I think the underside of the Jeep is way unprotected.

Thinking about painting as much of the JKU frame and underpan as I can get at with good paint, or possibly a bedliner type material like Raptor. Might still spray something like Fluid Film, Boeshield etc... inside the frame and on stuff that shouldn't be painted.

I have had outstanding results painting agricultural and heavy equipment with Sherwin Williams epoxy based "Tile Clad" industrial enamel (Tile-Clad HS Epoxy - Protective & Marine). Also painted the steel tub of my Ural sidecar with it (dog rides wet with salt water from the beach and it started to rust; totally stopped that problem). This stuff is elastomeric with excellent abrasion resistance.

Local 4x4 shop would spray underside with Raptor bedliner for ~$1200, but I don't think they would get at everything. Also don't think the underside needs as much abrasion resistance as a truck bed. Plus that's a lot of coin for me.

I’m here to learn. Anyone have suggestions for best underside and frame treatments? Thanks in advance!

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Old 03-07-2014, 02:11 PM   #2
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I've got some POR-15 waiting for mine when it warms up.

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Old 03-07-2014, 02:48 PM   #3
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Rustoleum works great.
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Old 03-07-2014, 03:46 PM   #4
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I'm avoiding anything that is grease or wax based, in other words that gets into some kind of crust, and that is supposed to last years. Even painting doesn't last long.

So I do apply a yearly oil based application. This is what has been working the best for all my vehicles since the last 30 years.

Here, at least, there is no miracle formulae, yearly application is the trick.
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Old 03-07-2014, 04:35 PM   #5
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I've got some POR-15 waiting for mine when it warms up.
+1 on the POR 15, great rust proofing paint.
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Old 03-07-2014, 04:50 PM   #6
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POR 15 - Heard a lot of good about it from others in passing.

Q: where is the best place to order POR 15 online and how much do you typically order? Is that a brush on application only scenario?

Thx!
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Old 03-07-2014, 05:38 PM   #7
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Rustoleum works great.
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Old 03-07-2014, 07:34 PM
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<snip> Here, at least, there is no miracle formulae, yearly application is the trick.
Yes, I think you Canadians understand corrosion control better than anyone. Keeping things oiled is a good strategy. I would just like to avoid the need for yearly treatment, at least in the relatively low risk areas I inhabit (Rocky Mtns and Florida).

A guy I know from Alaska just washes his trucks' undercarriages frequently; says undercoating of any kind is a waste. But he doesn't keep his vehicles more than 5-6 years. I'm planning on at least 20 with this Jeep. May not be able to afford a new one again.

So if I need to spend some money now, it will get spread out over a bunch of years, and pay off. But if I can do it myself and save, that's what I want to do.

Good thoughts so far, thanks everyone! Will be happy to hear other ideas; I will keep reading and learning.
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Old 03-07-2014, 07:53 PM
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+1 on the POR 15, great rust proofing paint.
Yes I've read a lot of good reports on this. But isn't POR 15 formulated for already rusted metal? I'm not sure it adheres real well on new glossy paint.

Rust Cure Formula 3000 rated at the top in Canadian Army tests (http://shufti.files.wordpress.com/2010/05/p526285.pdf), but I think it's only available in Canada. Have not been able to find a US source; may be worth a visit to Canada!

Boeshield was also near the top in the Canadian tests, and this is readily available in the USA.

USMC is the most aggressive in US military at preventing corrosion; the Marines like their equipment to last and they operate in salt water environments. Excellent corrosion control programs; see MARCORSYSCOM: Corrosion Prevention and Control (CPAC)

I will keep reading on this subject and post anything useful in this thread. Anyone else feel free to contribute. Thanks!
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Old 03-08-2014, 10:05 PM   #10
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the dealership undercoating is a ripoff, you can get the same thing for much much less usually. and the dealership most likely doesnt care whatsoever if they do it right. lots of undercoating shops in my area.

I dont like undercoating, i think its crap. I get under my jeep after the winter and look for rust. Hit it with chassis saver...

i got my jeep totally rust free and will probably keep it forever.
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Old 03-09-2014, 09:34 AM
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<snip> I dont like undercoating, i think its crap. I get under my jeep after the winter and look for rust. Hit it with chassis saver...
+1. The stuff dries up and flakes off, and even hides rust. The wax type materials like the Canadian rustproofing shops use are probably better. I am most concerned about the places I can't get at, e.g. inside of frame. I will probably spray Corr 3000 or Boeshield etc. inside the frame rails and crossmembers, and respray annually.

You have the right idea; look for any corrosion early and stop it before it does damage. This is the military approach.

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i got my jeep totally rust free and will probably keep it forever.
This is my goal; great seeing old Jeeps looking good and going strong. 'Up Hill Bill' has a 1943 Willys!
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Old 03-09-2014, 12:04 PM   #12
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You need to honestly bedline or atleast paint the floor inside the jeep. Pull your carpet out in the front (it's installed AFTER the seats are bolted in, so pretty easy to do.....might have to make a little slit if its never been out).

See that tar/toothpaste crap? It's a sound deadening material. On my jeep it trapped water under there and had started to rust.

Take that crap out, bedline, and leave the carpet out long enough for the bedliner to cure, and then just put the carpet back in
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Old 03-09-2014, 01:53 PM   #13
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Por-15 works great and will adhered to painted surface as long as you clean the area with the prep cleaners they offer.
I use KBS which is very similar to Por-15. KBS has worked pretty good for me.

RustSeal - Rust Prevention - Stop Rust Paint
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Old 03-10-2014, 10:22 AM   #14
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I have been working on ships for a long time and we use Coraseal(sp). It will neutralize the rust and seal it for painting. I used it on my 2002 F350 and when I sold it people looking at is said it had the least amount of rust on that type of truck they had ever seen. The Coraseal is industrial grade and it helped up keep a 60 year old ship looking new. POR 15 and rustoleum have nothing on this stuff.
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Old 03-10-2014, 11:01 AM
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<snip> You need to honestly bedline or atleast paint the floor inside the jeep. Pull your carpet out in the front (it's installed AFTER the seats are bolted in, so pretty easy to do.....might have to make a little slit if its never been out).

See that tar/toothpaste crap? It's a sound deadening material. On my jeep it trapped water under there and had started to rust.

Take that crap out, bedline, and leave the carpet out long enough for the bedliner to cure, and then just put the carpet back in
Great info; thanks! I did not know about this. Greatly appreciate the tip; will do this.

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<snip> I use KBS which is very similar to Por-15. KBS has worked pretty good for me. RustSeal - Rust Prevention - Stop Rust Paint
Thanks, I will have a look at this!

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<snip> I have been working on ships for a long time and we use Coraseal(sp). The Coraseal is industrial grade and it helped up keep a 60 year old ship looking new.
Yes this looks like the real deal; found it online Corroseal Rust Converter | Metal Primer | Rust Paint. I have huge respect for anything that works in the marine industry; no tougher environment. Had a steel hulled boat myself and it was a challenge to keep sound.

In my case I don’t have any rust to deal with right now, and like Michiganadam I want to avoid it. So I am leaning toward just getting a good coat of epoxy paint on everything for now, plus the inside work he suggests, and doing good twice-annual inspections (before and after winter) for any chipped or rusty areas.

If I get any rust I’ll go for the heavy marine artillery like you guys recommend!
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Old 03-10-2014, 11:43 AM   #16
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POR 15 - Heard a lot of good about it from others in passing.

Thx!
Having had several 70s-80s Fiats in the garage, I can +20 to POR-15 being an amazing product. Buy it buy the gallon - you will use it all.

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