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By 55 GLASS TOP - 4 Years Ago
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Hello I would like to paint or coat my rusty exhaust manifolds . Has anyone tried some of the stuff in spray cans available at the parts store thanks in advance
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By oldcarmark - 4 Years Ago
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I power wire Brushed mine using bench Grinder. I used Hi Temp Paint for Headers. Worked for Me. U have to try and get down to bare Cast Iron before painting them.
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By KULTULZ - 4 Years Ago
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SOURCE - https://www.jet-hot.com/articles/2018/6/29/5-important-reasons-you-should-ceramic-coat-your-exhaust-headers-and-turbo-parts
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By DryLakesRacer - 4 Years Ago
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After cleaning with wire brushes on a drill. die grinder, pedestal to start and some light sanding, I used Eastwood exhaust paint. Bought the smallest can available and used a brush. They have been on 7 years and still look good. Plenty left too for other cast parts like master cylinders, brake drums, etc.....
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By Cliff - 4 Years Ago
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Soak in 1/4 molasses (from the feed store, for horses) and 3/4 water, be sure to remove all grease first, let soak for 3 or 4 days (strong smell), rinse with water (strong spray), will look brand new no labor, I do this with blocks and heads, I rinse 1/2 the way through on really rusty parts. I pay $15.00 for 5 gallons that makes about 20 gallons, it lasts for years, when it gets low add more water.
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By NoShortcuts - 4 Years Ago
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Cliff. With the molasses mixture that you use, what do you use as a container for soaking large parts like cylinder heads and engine blocks?
In removing rust, the molasses mixture apparently etches the ferrous metal. Do you use soaking vessels made of plastic? Would galvanized steel be okay, or will the solution eat the zinc coating?
Thanks for the information! 
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By Rono - 4 Years Ago
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I like the VHT brand of high temperature paints. They sell a high temperature primer and then several top coat colors to choose from. In my personal opinion, I like to media blast rusty exhaust manifolds prior to painting. The media blasting provides a good texture to the iron for good paint adhesion. The fact that I have my own media blast cabinet helps!
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By Florida_Phil - 4 Years Ago
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You can use chemicals like Naval Jelly to remove rust. It's messy. I have them bead blasted then paint them with Eastwood's High Temp Coating. It has the look of cast iron. A little goes a long way. As you can see, I have had this can for years. It's nice because you can touch them up later.
 
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By Cliff - 4 Years Ago
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I use a plastic barrel cut in 1/2 I have left some parts in it for over 1 year (forgot) with no problems, I have 2 bead blasters it takes to much time to remove heavy deposits, easier to just wash and put it in the barrel, also it cleans inside the water jackets.
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By Pete 55Tbird - 4 Years Ago
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I have had very good results removing rust from cast iron exhaust manifolds ( any ferrous metal ) by using electrolysis. Google it. Pete
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By BamaBob - 4 Years Ago
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In regard to cleaning exhaust manifolds, what is the best way to get the baked on carbon deposits out of the inside of the manifold?
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By Pete 55Tbird - 4 Years Ago
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A youtube video of degreasing derusting a flathead engine using electrolysis. Check it out. Simple, safe( NO TOXIC RESIDUE)
https://www.youtube.com/watch?v=njtyZzDBHzg
Pete
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By Bobwanna - 4 Years Ago
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Bama, I have used caustic old oven leaner in the past to soften the burnt on carbon. Did that long ago. No sure if the new "reformulated" cleaners works as good as the old. Do wear gloves. - Bob
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By Joe-JDC - 4 Years Ago
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Best way? Sand blasting inside and out. Removes rust, scale, carbon, slag and leaves a clean dry surface for paint. Start out with high pressure, and lower the pressure for finishing to make the texture less rough. I have ported several of them inside and left the inside with a polished surface. Lots of work, but stealthy. Joe-JDC
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By GREENBIRD56 - 4 Years Ago
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I'm a true believer in using a ceramic coating - save up and do it! You won't regret it for a minute. This set now on my bird - was done by "Jet-hot" in aluminum finish, inside and out. They also offer a color that looks like fresh blasted cast iron. High temp resistant - and as advertised it lowered the underhood temp of the manifold by a couple of hundred degrees.
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