Best High Temp Coating for Cast Iron - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Roscoep · 08-23-2011, 10:54 AM

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?

Mike Bradbury · 08-23-2011, 11:01 AM

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.

**Already Gone** · 08-23-2011, 11:15 AM

ttt

stomper · 08-23-2011, 12:19 PM

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.

Gene · 08-23-2011, 02:06 PM

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.

webfoot · 08-23-2011, 02:11 PM

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.

Shaky · 08-23-2011, 05:35 PM

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.

PanelDeland · 08-23-2011, 06:37 PM

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.

**leddzepp** · 08-23-2011, 06:56 PM

I use POR 20 hi temp paint. Daily driven, has held up for over 4 years.

Eddie H. · 08-23-2011, 07:19 PM

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.

slikside · 08-23-2011, 07:46 PM

subscribed

Hubscrub · 08-23-2011, 08:03 PM

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)

hayhauler71 · 08-23-2011, 09:50 PM

http://jet-hot.com/

VA72C10 · 08-23-2011, 10:13 PM

Quote:

Originally Posted by leddzepp

I use POR 20 hi temp paint. Daily driven, has held up for over 4 years.

were the manifolds blasted or rusty?

**leddzepp** · 08-24-2011, 03:09 AM

Quote:

Originally Posted by VA72C10

were the manifolds blasted or rusty?

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.

xludan · 08-24-2011, 09:37 AM

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.

08-23-2011, 10:54 AM	#1
Roscoep Senior Member Join Date: Aug 2007 Location: Jackson, MS Posts: 80	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? __________________ Robert 71 Chevy SWB

08-23-2011, 11:01 AM	#2
Mike Bradbury Registered User Join Date: Apr 2008 Location: San Diego California Posts: 1,316	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. __________________ I'd rather attempt something great and fail.. than try something ordinary and succeed. Norman Vincent Peale Project: Barn Raising http://67-72chevytrucks.com/vboard/s...d.php?t=414961 Project: 30 Be Low https://67-72chevytrucks.com/vboard/...d.php?t=830583

08-23-2011, 11:15 AM	#3
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,139	Re: Best High Temp Coating for Cast Iron ttt __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

08-23-2011, 12:19 PM	#4
stomper Junior Member Join Date: Jul 2002 Location: Scottsdale, AZ Posts: 1,701	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. __________________ "I was patina when patina wasn't cool." 1973 Cheyenne SWB Sunset Gold / Frost White / Saddle

08-23-2011, 02:06 PM	#5
Gene Registered User Join Date: Aug 2002 Location: Muskogee, Oklahoma Posts: 2,914	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. __________________ 1971 SWB 4X4 Build BOARD MEMBER #5448 BOOMER SOONER!!!!

08-23-2011, 02:11 PM	#6
webfoot Registered User Join Date: Nov 2007 Location: Hermiston, OR Posts: 947	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. __________________ *Running in place gets you nowhere fast.* -me 1968 GTO 4-spd covnvertible 1970 K-20 4-speed, factory AC.

08-23-2011, 05:35 PM	#7
Shaky Six in a row makes it go... Join Date: Mar 2009 Location: Vacationland: Maine Posts: 1,346	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. Attached Images __________________ 67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce

08-23-2011, 06:37 PM	#8
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,993	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. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

08-23-2011, 06:56 PM	#9
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 20,017	Re: Best High Temp Coating for Cast Iron I use POR 20 hi temp paint. Daily driven, has held up for over 4 years. __________________ 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 RIP FleetsidePaul

08-23-2011, 07:19 PM	#10
Eddie H. Registered User Join Date: Mar 2001 Location: Paradise TX USA Posts: 1,200	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. __________________ "Negative people always seem to have a problem for every solution"

08-23-2011, 07:46 PM	#11
slikside Registered User Join Date: Jun 2010 Location: San Diego Co. Posts: 1,176	Re: Best High Temp Coating for Cast Iron subscribed

08-23-2011, 08:03 PM	#12
Hubscrub Cruzin Join Date: Dec 2009 Location: on the road Posts: 2,835	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) Attached Images __________________ Lime Wife's 67https://www.google.com/url?sa=t&rct=...wZEMODaS2d94u8 Back to the Fifties 59 https://www.google.com/url?sa=t&rct=...NAeStpydfrcj_U Proverbs 3:5,6 "Thanks to the Interstate Highway System, it is now possible to travel across the country from coast to coast without seeing anything."Charles Kuralt In memory of our first baby daughter, daddy and mommy love you. Danica Grace 6/26/14

08-23-2011, 09:50 PM	#13
hayhauler71 Registered User Join Date: Aug 2009 Location: St. Paul MN. Posts: 1,996	Re: Best High Temp Coating for Cast Iron http://jet-hot.com/ __________________ Fuzzy

08-24-2011, 09:37 AM	#16
xludan Registered User Join Date: Jan 2010 Location: Minneapolis MN Posts: 202	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. __________________ 1971 C10 Cheyenne Super Build Thread Here: http://67-72chevytrucks.com/vboard/s...d.php?t=411867



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