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#1 |
Senior Member
![]() Join Date: Aug 2007
Location: Jackson, MS
Posts: 80
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Best High Temp Coating for Cast Iron
I want to put a good finish on my rams head cast iron headers. I see brush-on, spray and a rub on dressing. I want it to hold up, what do you guys recommend?
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#2 |
Registered User
![]() Join Date: Apr 2008
Location: San Diego California
Posts: 1,316
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Re: Best High Temp Coating for Cast Iron
I will be interested in the replies because I want to do the same thing.
Eastwood had a high temp powder coat that was specifically designed for exhaust manifolds and headers but had to hold off production because some shipping issues that affected the product performance, and I never got to try it while I was building my exhaust.
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#3 |
70+ ( Old Skool Club )
![]() Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,119
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Re: Best High Temp Coating for Cast Iron
ttt
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#4 |
Junior Member
Join Date: Jul 2002
Location: Scottsdale, AZ
Posts: 1,701
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Re: Best High Temp Coating for Cast Iron
I have been pleased with results using eastwood's high temp exhaust manifold paint applied with a foam brush. Comes in a little can. I have used both the brighter silver and after it was available, the cast iron color. Best results were with freshly sand blasted manifolds and follow the instructions. I recall you are supposed to let it dry before you start the engine and bake it on. It can make a significant visual difference on rusty manifolds but the rust will eventually come thru applied that way. Applied to sandblasted manifolds per instructions the finish has lasted many years on my Sunday drivers.
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"I was patina when patina wasn't cool." 1973 Cheyenne SWB Sunset Gold / Frost White / Saddle |
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#5 |
Registered User
Join Date: Aug 2002
Location: Muskogee, Oklahoma
Posts: 2,914
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Re: Best High Temp Coating for Cast Iron
I bought some VHT hi-temp paint that is supposed to be good to 2000 degrees(we shall see) I have started the truck and let it idle and so far so good. I soaked my manifolds in vinegar for a week then rinsed and dried right before coating them.
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#6 |
Registered User
![]() Join Date: Nov 2007
Location: Hermiston, OR
Posts: 947
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Re: Best High Temp Coating for Cast Iron
I used the eastwood cast-gray coating that you apply with the foam brush. I broke my motor in on it (pontiac 400 with ram air manifolds) and they looked good after. It goes on a little streaky. The VHT cast grey 2000 stuff looks very good but I haven't tried it on a manifold.
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Running in place gets you nowhere fast. -me 1968 GTO 4-spd covnvertible 1970 K-20 4-speed, factory AC. |
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#7 |
Six in a row makes it go...
![]() Join Date: Mar 2009
Location: Vacationland: Maine
Posts: 1,346
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Re: Best High Temp Coating for Cast Iron
I used the Eastwood brush-on stuff also. My buddy claimed he had good luck with it and the engine shop suggested it also. I haven't fired it up yet, so I don't know.
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#8 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: Best High Temp Coating for Cast Iron
Mine looks good.I pretty much followed the directions on the VHT can.I didn't blast but used a wire brush and cleaned thoroughly.It has held up well for the 2-3 months it's been on there.I did just the exhuast with it.
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#9 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,005
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Re: Best High Temp Coating for Cast Iron
I use POR 20 hi temp paint. Daily driven, has held up for over 4 years.
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#10 |
Registered User
Join Date: Mar 2001
Location: Paradise TX USA
Posts: 1,200
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Re: Best High Temp Coating for Cast Iron
I've got some ram horn manifolds that I sandblsted and applied the Eastwood brush on coating. I've been running them for 20 years or so and they still look pretty good.
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#11 |
Registered User
Join Date: Jun 2010
Location: San Diego Co.
Posts: 1,163
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Re: Best High Temp Coating for Cast Iron
subscribed
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#12 |
Cruzin
Join Date: Dec 2009
Location: on the road
Posts: 2,835
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Re: Best High Temp Coating for Cast Iron
i used easwood's brush on manifold paint on my 71 has held up pretty good and easy to re coat and just high temp grill paint on my wife's 67 (it hasn't been run but a couple hours so far)
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#13 |
Registered User
Join Date: Aug 2009
Location: St. Paul MN.
Posts: 1,996
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Re: Best High Temp Coating for Cast Iron
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#14 |
VA72C10
![]() Join Date: Mar 2008
Location: Midlothian, VA
Posts: 25,269
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Re: Best High Temp Coating for Cast Iron
were the manifolds blasted or rusty?
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#15 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,005
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Re: Best High Temp Coating for Cast Iron
I cleaned them with a wire brush. POR 20 and POR 15 are different formulas. If you put regular POR 15 on an exhaust manifold, it will burn off.
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#16 |
Registered User
Join Date: Jan 2010
Location: Minneapolis MN
Posts: 202
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Re: Best High Temp Coating for Cast Iron
I used POR20 on mine. They recommend coating them right after sandblasting and thats what I did. The header on the right is bare metal after sandblasting. The header on the left is coated with POR20.
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