I have had great luck with simple high temp cast iron gray exhaust spray paint.
The key is to follow the instructions on the can -- the one I used said to bake them for 2 hours at 550 degrees to cure them. (Heating them too hot too fast, or not heating them at all, will cause it not to coat right.) Smelled pretty bad in the kitchen, but a window fan eventually took care of that and the smell didn't hang around after I finally aired it out. If my oven would have actually been clean beforehand it probably wouldn't have smelled as bad.
The last manifolds I did were on the DeLorean. If you check out http://www.projectvixen.com/week20.htm you can see the cast manifolds and the other pipes I did in black. They still look perfect 10 years later, and that engine with the turbos runs a LOT hotter than our MoPars.
What procedure did you go thru before coating the manifolds ? And how long has it been since you used the manifold paint ? Is any rust coming thru ?
I sandblasted mine, then painted with the Eastwood stuff. Rust was visible within six months. Then I brought them to a high temp coating place,where they put some type of ceramic type coating on. Mounted these on the car. But again have some rust coming through.
Ron
----- Original Message -----
Sent: Tuesday, May 04, 2010 9:41 PM
Subject: Re: [FWDLK] Exhaust manifold paint
I use the POR15 manifold paint...goes on easy brush on, and lasts looks great.
----- Original Message -----
Sent: Tuesday, May 04, 2010 8:25 PM
Subject: [FWDLK] Exhaust manifold paint
What are you guys using to paint your exhaust manifolds. (for my 56 plym, v8)
I was going to get some eastwood gray high temp, but the website says it's on back order until May 18th. Don't really feel like waiting that long for it.
Nick
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