Spraying bed liner on the underside of new front fenders

[gg1]

I was wondering what people thought about that. I think the front fenders have a design flaw with those odd channels that collect debris and rust. I was thinking of just spaying the whole underside of my new fenders with black bed liner out of a spray can. Just wondering what people thought about the idea. Am I missing anything? Will it look bad? The rears have a liner in place that is black, so I am thinking it will be fine, but just figured I would see what you all think before I go spraying that stuff. Thanks.

 

[Rob5589]

Wouldn't be a bad idea. Years ago we used a 3M undercoat product that comes in spray can form. It was very good and not cheap but held up to everything the road flung at it.

 

[fourpointzero]

The above is something that Ive considered for some time w my JCR fenders. After a lot of persona debating, I decided to forgo the option. My reasons are:
1- The bed liner doesn’t color match the fender paint I used. Not a big deal if I simply mask off the sides. But I’ve got no desire to delay the install any longer.

2- I decided to use Fluid Film or other lubricant to repel the moisture.

End of day, only time will tell if it indeed works.


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[JMT]

Is bedliner hard to clean? I mean do they pick up dirt and grit that is difficult to wash off without scrubbing?

Are you talking about fenders or flares?

 

[weldedcambolt]

I was just reading someone the bedliner will trap the moisture an cause rusting, for underneath anything? I would have to assume the same, if you aint gonna sand it all down perfectly an apply it an get all the moisture out, before spraying. heard better stuff about just spraying it down with lube like he said above, some others were using other oils.

also, a buddy of mine, gots a buddy of his, that gets it undercoated every year, an it looks, brand new? the canadian krown?

 

[ThatsilverTJ]

I've been debating it for a while as well

 

[Leinhit]

I did some this and really like it. You could go with the rubber ized under costing spray from Rust-Oleum as well.

But I used the rustoleum bed liner and really like it.

I ve used it under the front fenders and other areas as well. I like the spray better than roll on because it has a finer finished look texture.

2-3 coats sprayed on. I'm in Michigan and know something about rust, etc



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[TJ2]

IMO the bed liner and/or rubberized paint is a very bad idea. First off, it's hard to clean the surface.

More so, during winter weather they collect salty moist and creep into little chip and peeled spots from rocks and or debris hitting them from the spinning wheels.

Remember, these surfaces are being roughed-up on everyday of driving and you do not see them as much just like the outside body surfaces. I think painting them is more compromising the longevity of the metal.

Fluid film or power wash regularly is more effective. IMHO, painting them is more of a "cop-out".

 

[bruceco]

I put new fenders on my 2000 tj.It is black,faded here and there.I used the truck bedliner from walmart,not the rubberized and it looks good. I did the tops and underneath.There was a pic of someone who had a red one and the black looks good on his fenders. I drilled some small 3/16 holes on each of the underneath ribs so they can drain. Hope it works.

 

[ThatsilverTJ]

IMO the bed liner and/or rubberized paint is a very bad idea. First off, it's hard to clean the surface.

More so, during winter weather they collect salty moist and creep into little chip and peeled spots from rocks and or debris hitting them from the spinning wheels.

Remember, these surfaces are being roughed-up on everyday of driving and you do not see them as much just like the outside body surfaces. I think painting them is more compromising the longevity of the metal.

Fluid film or power wash regularly is more effective. IMHO, painting them is more of a "cop-out".

I have various parts painted with the spray liner and they are the cleanest spots on my jeep. No joke, the spray is thinner than the roll on and is just barely textured.. it sprays clean without any rubbing or scrubbing when it's time to wash, I have even done my hardtop 3 years ago..still going strong,and still black not faded. Application/prep is key With this stuff. If its applied correctly it should work great wherever it is

 

[RussTJ]

I did some this and really like it. You could go with the rubber ized under costing spray from Rust-Oleum as well.

But I used the rustoleum bed liner and really like it.

I ve used it under the front fenders and other areas as well. I like the spray better than roll on because it has a finer finished look texture.

2-3 coats sprayed on. I'm in Michigan and know something about rust, etc



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How long ago did you do this?

 

[Leinhit]

How long ago did you do this?

I did both last year when I replaced both front fenders with new... I can take a pic of the underside if anyone is wondering how it looks or holding up

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[ThatsilverTJ]

It GOOD STUFF if applied correctly

 

[RussTJ]

I did both last year when I replaced both front fenders with new... I can take a pic of the underside if anyone is wondering how it looks or holding up

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I'd like to see it. I have a replacement fender that I'll be putting on soon and want to avoid (or slow down) the rust problems.

 

[gg1]

I'd like to see it. I have a replacement fender that I'll be putting on soon and want to avoid (or slow down) the rust problems.

Studying the fenders with a body man and my mechanic the problem is in the design of the fenders themselves. You need to keep water out of the seems and that odd channel under there. I might even silicon the seems prior to going big with fluid film that I am going to do pretty soon over the entire underside of my TJ. My Jeep won't see much salt to be honest since I just don't drive much in the winter, I tend to bicycle more. Bikes are cheaper. lol

 

[bruceco]

I worried about the new ones I put on also, but drilled the holes hoping that helps. Since the fenders lasted this long on my 2000 I stopped being concerned.I use fluid film and won't be driving it in the winter anyway since I did all this frame work on it.It will outlast me.

 

[Leinhit]

I'd like to see it. I have a replacement fender that I'll be putting on soon and want to avoid (or slow down) the rust problems.

Here's a couple pictures in all of its dirty Glory. I didn't bother to clean it first.

Keep in mind you certainly can use rubberized undercoating spray which would act sort of self-healing for Nicks and scratches Etc. But it will be messy.

I like the bed liner spray because it stops and doesn't ship off from what I've seen.

And yes as pointed out the fenders have some odd channels and places that can collect dirt and water and not much you can do about it but coating it certainly is going to help

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[cjaama]

I think the front fenders have a design flaw with those odd channels that collect debris and rust.

You’re number one priority should be keeping water and crap out or allowing it to drain out by drilling holes as mentioned by someone else.