Painting a cast iron exhaust manifold

[928cdu]

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 !

[dcunn]

Re: Painting a cast iron exhaust manifold

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

[milliemarlin]

Re: Painting a cast iron exhaust manifold

In my experience the only coating that has any longevity on a cast iron manifold is rust.
Paul

[928cdu]

Re: Painting a cast iron exhaust manifold

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 !

[listerjp2]

Re: Painting a cast iron exhaust manifold

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

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

[milliemarlin]

Re: Painting a cast iron exhaust manifold

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