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Thread: Painting a cast iron exhaust manifold

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  1. #1 Painting a cast iron exhaust manifold 
    frequent forum contributor Club Member 928cdu's Avatar
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    Any one have any good recommended paint & preparation methods for re-finishing a cast iron exhaust manifold.

    I needed to the the old herald manifold off as the studs were stripped, causing the exhaust to blow. Whilst I have it off, I thought it deserved a lick of paint.

    Don't want something that will last 5 minutes !

    Any suggestions welcome !
    Triumph Herald 1200 based Roadster
    Bought in 1983 as a running restoration
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  2. #2 Re: Painting a cast iron exhaust manifold 
    Club Member dcunn's Avatar
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    Mornin' Richard - I don't know about High temperature primers but in the past I've found High Temp paint
    spray cans (use several coats) to be quite effective direct onto a degreased (use cellulose thinners or meths) surface

    For longevity the finish needs to "cook off" and the instructions for this are on the cans
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  3. #3 Re: Painting a cast iron exhaust manifold 
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    In my experience the only coating that has any longevity on a cast iron manifold is rust.
    Paul
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  4. #4 Re: Painting a cast iron exhaust manifold 
    frequent forum contributor Club Member 928cdu's Avatar
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    Thanks for your suggestions Dave and Paul, I eventually went for Paul’s option. I couldn’t stand the car being off the road another week !

    The old studs refused to come out, so they had to be drilled, holes re-tapped and new studs.. test drive later !
    Triumph Herald 1200 based Roadster
    Bought in 1983 as a running restoration
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  5. #5 Re: Painting a cast iron exhaust manifold 
    frequent forum contributor Club Member listerjp2's Avatar
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    Hi

    My mate with his 1965 e-type jag has used this and still looked good after the drive to Le Mans Classic and back via Calaise.

    Rustoleum 1078-7778-1015-7715 High Temp Black-Aluminium(1).pdf


    Quote Originally Posted by dcunn View Post
    Mornin' Richard - I don't know about High temperature primers but in the past I've found High Temp paint
    spray cans (use several coats) to be quite effective direct onto a degreased (use cellulose thinners or meths) surface

    For longevity the finish needs to "cook off" and the instructions for this are on the cans
    Reply With Quote  
     

  6. #6 Re: Painting a cast iron exhaust manifold 
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    Just to prove I wasn’t being flippant I got this from Wikipedia “As with other metals, like aluminium, a tightly adhering oxide coating, a passivation layer, protects the bulk iron from further oxidation.”
    Paul
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