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Username Post: Refinishing exhaust manifolds        (Topic#360514)
NOVA447 
Newbie
Posts: 15

Loc: Vienna, Virginia
Reg: 01-12-13
04-13-20 11:53 AM - Post#2791049    

I would like to refinish my stock exhaust manifolds so they look somewhat like the original, as-cast appearance but don’t get all rusty over time. Engine is out and now is the time. I appreciate any recommendations based on actual experience. Thanks.




 


carolinakid 
"8th Year" Silver Supporting Member
Posts: 973
carolinakid
Loc: Erwin NC
Reg: 08-27-03
04-13-20 04:31 PM - Post#2791078    
    In response to NOVA447

Have them sand/bead blasted and the use a quality high temp primer/prep coating and then again use a quality cast iron High Temp paint. I used a Eastwood product with good results.



 
Highlander1 
"5th Year" Silver Supporting Member
Posts: 1760
Highlander1
Loc: SE North Carolina
Reg: 08-19-04
04-13-20 10:42 PM - Post#2791109    
    In response to carolinakid

Kid, what primer did you use? Is it specifically high heat?

Does the Eastwood product have to be heat cured? My only experience was headers and although I forgot what the max time was but once installed I had starting difficulties and it was the next day before we got it running. Most of the paint flaked off. I

Has anyone used an etching solution such as Por-15 Metal Prep on cast iron? I used this on the headers and wondered if this was the problem.

Thanks,

Don



 
carolinakid 
"8th Year" Silver Supporting Member
Posts: 973
carolinakid
Loc: Erwin NC
Reg: 08-27-03
04-14-20 04:43 PM - Post#2791159    
    In response to Highlander1

I used Rustoleum HIGH HEAT PRIMER 249340 and Eastwood High Temp Coating Factory Gray.

I have used Por 15 Prep and Ready and Por 15 Factory Manifold Gray on my 56 manifolds with good results also. A bit on the high price side though. About $50 for the two



 
NOVA447 
Newbie
Posts: 15

Loc: Vienna, Virginia
Reg: 01-12-13
04-14-20 07:26 PM - Post#2791174    
    In response to carolinakid

Thanks for the tip on the Rustoleum primer. I hadn't thought about priming before a top coat, but it's a good idea.
John



 
Powerglide56 
Poster
Posts: 69

Age: 53
Loc: SE Florida
Reg: 01-07-10
04-14-20 07:27 PM - Post#2791175    
    In response to NOVA447

Calyx if it's still available.



 
Jalapeno 
Member #252
Posts: 9856
Jalapeno
Loc: The Republic of Texas
Reg: 04-30-00
04-15-20 09:57 PM - Post#2791255    
    In response to Powerglide56

Calyx does not last very long before the rust comes back.

Jalapeno


 
56chevytimes2 
Contributor
Posts: 579
56chevytimes2
Loc: Dale City , VA
Reg: 04-14-04
04-16-20 04:35 AM - Post#2791259    
    In response to Jalapeno

por-15 makes a cast iron manifold paint been on my wife's 56 since 2006 still looks good and on my wagon (sanderson cast manifolds) same thing holding up well i did blast them first to give them tooth and no rust.

Kurt

56 4dr 210 wagon Grocery getter
56 4dr 210 sedan Betsy's Page
The Rest of the Garage


Edited by 56chevytimes2 on 04-16-20 04:35 AM. Reason for edit: No reason given.

 
ThumperNZ 
Contributor
Posts: 570
ThumperNZ
Loc: New Plymouth, New Zealand
Reg: 07-08-07
04-16-20 11:16 PM - Post#2791353    
    In response to 56chevytimes2

I've been using the POR15 Manifold Gray for more than 8 yrs, has stood up very well. I have found the brushing it on works better than spraying. The manifold must be blasted to gray metal, then coated immediately. After 1 day, I then bake it at 500°F for an hour. By the time it's ready to fit it's rock hard.

'57 Model 1037D COMPLETED! (but are they really?


 
toms57 
Senior Member
Posts: 529

Loc: Caney, Ks, USA
Reg: 10-28-01
04-19-20 07:43 AM - Post#2791506    
    In response to ThumperNZ

I have good results with Eastwood's manifold paint. I apply it with a foam brush. I have found that it can be retouched easily and with good results as rust does show back thru. I have not tried any primer under it, so I don't know that it is really needed. I just touch it up as needed. (not often)

Toms57




 


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