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Discussion Starter #1
Folks,

I picked up some Rustoleum bedliner to patch a few spots I'll be grinding on my light bar. This will take about three sprays and leave me with a near full can of spray on bedliner.

My thought is to spray it on some of the rapidly rusting portions of the undercarriage. It is Rustoleum after all.

Any words of wisdom? Anything I should avoid--for example, will the muffler or the tail pipe get too hot, etc.? Is bedliner just not the product for this?
 

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I'm about to do my skid plates. I just have to go out and get the cans of it. I'm getting the rustoleum tho. I also want to bed line the inside and the part of the rocker panel that is angled to go behind the steps
 

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So we're good right? If it's under the Jeep and it's rusting, I can bedline it with Rustoleum? Exhaust, driveshafts, etc., no problem?
 

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krutj said:
I used the same stuff on my rockers and under the tailgate area, for the muffler, I used a high heat paint (it's cheaper)
Yeah, I'm a little concerned about whether the bedliner will handle the heat on the exhaust parts. It may do fine, I just have no idea one way or the other.

Nice looking Jeep, btw. Are those Mountain Edition pull offs?
 

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Yeah, I'm a little concerned about whether the bedliner will handle the heat on the exhaust parts. It may do fine, I just have no idea one way or the other.

Nice looking Jeep, btw. Are those Mountain Edition pull offs?

Thanks for the compliment..but no, I rattle canned 'em, same with the grill..rustoleum bedliner!!

The wheels are a combo of primer and satin black rattle can...:punk:
 

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Discussion Starter #8
I did this today, by the way.

Got a good undercarriage wash at a nearby place, let the Jeep dry, and then put Rustoleum bedliner on everything on the undercarriage showing any rust--driveshafts, skids, differentials, t-case, axle ends, etc. I picked up a can of the "high heat" Rustoleum for the exhaust system parts.

I'll be watching to see how it holds up. Total cost was about $20, and the undercarriage certainly looks a lot better in black--especially that big stock muffler. :D
 

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Discussion Starter #10
Sounds like a great idea, let us know how it works please. Does the Rustoleum leave any noticeable coating? Does it go on evenly and look clean? Thanks
It literally looks flat black. In other words, you know that big silver stock muffler you see protruding from underneath your rear bumper? Mine's black. Looks better, I think. I'll see if I can get a daylight photo tomorrow morning. Per the instructions on the cans, I gave it a few coats, so it looks very even and clean.
 

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OK cool thanks for the help. If you spray it over the surface rust anywhere on the undercarriage that's fine?
That's what I originally asked at the top of the thread, and nobody said otherwise. I'd like to think the folks here would stop me from doing anything really asinine. :redface: As the collective wisdom gave no objections, I gave it a go.

Common sense (admittedly dangerous) tells me it should be fine. All the stuff under your Jeep is routinely exposed to water, salt, dirt, etc., so how bad could a few coats of Rustoleum really be? Why it would be worse than just leaving everything alone, which is presumably safe? Stuff does rust under there, so wouldn't this be at least marginally helpful by slowing (or stopping) that process?

I was slightly concerned about the heat of the exhaust cooking the bedliner off, so I went with the high-heat stuff for those areas. That may have been necessary or may not, I'll probably never know.

My expectation is that it'll do fine, and I'll make it part of my yearly maintainance to toss on a new coat before each winter.
 

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DON"T spray the bedliner on the exhaust pipes or exhaust system at all...you'll regret it! Use only high heat proof paint if you have to...like stovepipe black.
If you spray bedliner on any heated pipes...it WILL start to cook off, and CAN flake off and start fires in the summer...and the SMELL of it cooking off your pipes and stuff will drive you out of the vehicle...it just is BAD...so please avoid doing that!
We fixed rust holes, patched floor panels, etc. in a cherokee and sprayed bedliner around everything to protect it and prevent further rusting out...and got some on the exhaust and heat deflector by mistake...wheeeeeeooooo! What a stink....so don't do it. And none of it stuck to the heated surfaces-it dried up, flaked or burnt off. Waste of it if you did it deliberately. I know there is paint made to stick to manifolds, get that if you can find it.
 

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DON"T spray the bedliner on the exhaust pipes or exhaust system at all...you'll regret it! Use only high heat proof paint if you have to...like stovepipe black.
Thanks.

This is exactly what I was concerned about and why I DIDN'T do it.

I used Rustoleum bedliner on everything under the Jeep EXCEPT the exhaust parts. On the exhaust parts--including that stock muffler you see in the pic--I used Rustoleum HIGH HEAT PAINT. I'm good to 2000 degrees. ;)
 

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Discussion Starter #18
daggo66 said:
Did you drop the muffler to do that or just cover the bumper?
Neither. I was just careful so as to not spray the bumper. The spray can gave a pretty narrow spray that was easily controlled.

I was able to get some of the spray up and over the top of the muffler, but I would expect that if I were to drop the muffler, there would be some exposed metal on the top.
 

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how has the rustoleum held up MTH? i'm very well set on getting two cans tomorrow and coating my undercarriage in it.
 

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how has the rustoleum held up MTH? i'm very well set on getting two cans tomorrow and coating my undercarriage in it.
Pretty good. I touched it up once or so a few months ago. I think you should view it as an annual maintenance sort of thing rather than a permanent fix.

Rustoleum also makes another product called "Rust Reformer" that likewise goes on black and seems to spray easier, though I'm not sure it's as sturdy as the bedliner. That's a dedicated product designed for rust, though it may require an extra touch up or two a year. I used both (I had about half a can of each) when I did my touch up, so at this point I've got them both under there.

Just steer clear of hot components. You need high heat paint for that.
 
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