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Unread 09-10-2013, 07:26 PM   #1
Mfrancis
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Painting exhaust

Did a search, but didn't find an answer to my question. My JKU is black and I want to paint the stock exhaust black. I have hi-temp black rattle can, but I can't find any primer that says hi-temp. Do I necessarily need to prime it?

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Unread 09-10-2013, 09:33 PM   #2
Rtone1583
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I don't think you have to use primer for high temp paint but the last time I painted any high temp parts was about 20 years ago so I may be way off base on this. One thing I do remember is that the prep work is even more important on high temp applications than normal if you want the finish to last for any length of time.
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Unread 09-10-2013, 09:39 PM   #3
xcstar
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From rustoleums website:


Make sure surface is clean and oil free. To prep the surface, wash with soap and water, then clean with Rust-Oleum Wax & Tar Remover. For heavily soiled areas you may need to repeat cleaning. Let area dry completely before beginning the next step.
Mask off areas surrounding the part to be painted to protect the rest of the vehicle from overspray.
Spray on the Rust-Oleum High Heat Primer.
Apply the Rust-Oleum High Heat Spray.
If you are baking a part in the oven, please know that the item may emit smoke and a harmless odor, This is normal. Also, make sure you don’t exceed the heat tolerance of the least heat tolerant part.
To cure painted parts on the vehicle, run your engine idle for 10 minutes. Next, shut off the engine and let cool for 20 minutes. Then, start the engine and idle for 20 minutes, followed by another 20 minutes of cooling with the engine off. Finally, run the vehicle under normal operating conditions for 30 minutes, after which you should allow the components to cool completely.
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Unread 09-10-2013, 09:57 PM   #4
SubAtomicGenius
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In my experience, the high heat paint simply does not work on automotive exhausts. Rust sets in quickly. You're better off not wasting your time IMHO.
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Unread 09-10-2013, 10:05 PM   #5
Kiriesh
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I rattle canned mine with high heat and it seems to have held up ok. The sucker had already rusted some so I just cleaned what I could before I did. Not really expecting to stop a lot of rust but atleast better than seeing that rusty can under my rear bumper any time I look at the back.
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Unread 09-11-2013, 05:45 AM   #6
bbermann
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I had a hankerin to get this done shortly after getting the Jeep and just had plain black Rustoleum sitting around. I wiped the muffler with isopropyl alcohol and sprayed away.

It has been perfect for 11 months now.

Make sure the exhaust is not hot if wiping with IPA (or spraying paint).
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Unread 09-11-2013, 06:54 AM   #7
wingit
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Anyone have pics? Not close ups but what you would see as you walk up. I never thought about it but this seems like a good idea.
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Unread 09-11-2013, 09:07 AM   #8
Mfrancis
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I'm doing it for looks, not rust cover up/prevention. My JKU only has 600 miles on it. I plan on getting aftermarket exhaust down the road. I just want it to look good for now.
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Unread 09-11-2013, 09:10 AM   #9
rainmn
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I did mine a few months ago with some type of high heat paint, can't remember what brand. It was very rusty already when I did it, so I didn't have high hopes. I just cleaned up as much of the rust as I could, wiped it down with denatured alcohol and sprayed away.

Some of the rust is starting to come through, but it's not noticeable until you get very close up. Still looks much better than it did before painting it. Until I replace the exhaust, I'll probably just spray another coat of paint every few months.

On a related note, does anyone know of a stainless exhaust that is no louder than stock?
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Unread 09-11-2013, 09:32 AM   #10
DangFoo
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Quote:
Originally Posted by Mfrancis View Post
Did a search, but didn't find an answer to my question. My JKU is black and I want to paint the stock exhaust black. I have hi-temp black rattle can, but I can't find any primer that says hi-temp. Do I necessarily need to prime it?
No primer needed; I painted the exhaust on our 2008 after it started to discolor. I didn't even bother to tape-off (mask) the surrounding area. I grabbed a piece of cardboard and wedged it behind the exhaust and used High Temp flat black spray paint (aka Barbecue Paint). It has held-up very well with the occasional quick re-spray, as paint naurally oxidizes.

I'm going to do the same on our 2013 if the muffler and tail pipe start to discolor.
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Unread 09-11-2013, 09:42 AM   #11
DangFoo
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Quote:
Originally Posted by wingit View Post
Anyone have pics? Not close ups but what you would see as you walk up. I never thought about it but this seems like a good idea.
Here are a few pictures; from a distance (not the best clarity from a cell picture), close-up, and the paint that I used.
photo-3-.jpg

photo-5-.jpg

photo-4-.jpg

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Unread 09-11-2013, 09:43 AM   #12
DangFoo
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Also, the second picture makes the exhaust look brown, but it looks good and more of a true matte black in person; just haven't washed underneath in a while.
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Unread 09-11-2013, 09:59 AM   #13
Mfrancis
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Sweet DangFoo. I wasn't planning on going all over town looking for hi temp primer. Did you remove the muffler to do yours?
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Unread 09-11-2013, 10:55 AM   #14
DangFoo
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Quote:
Originally Posted by Mfrancis
Sweet DangFoo. I wasn't planning on going all over town looking for hi temp primer. Did you remove the muffler to do yours?
No need to remove the muffler. Just park in a well ventilated area and use a flexible piece of cardboard to protect other parts, frame, and the body from overspray. I did a few coats and this stuff dries very fast in all but the coldest of temperatures. I didn't show a side photo, but I coated the tailpipe as well, so that it's a uniform look.
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Unread 09-11-2013, 11:04 AM   #15
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I used high temp header paint. rubbed down with a 3m sanding pad and sprayed in place. Now it's more brown with baked on mud and clay.

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