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Painting a chimney


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Not easy to get anything to stick to stainless. Sand, clean with acetone then paint with epoxy, something like Jotamastic 87/90 Will stick on fine but its not easy to get a good finish and not sure how it copes with temperature, but a bit on my exhaust has coped fine.

 

 

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10 minutes ago, blackrose said:

What about engine paint? Will that stick to stainless?

 

There are plenty of black stainless boat chimneys around so they must get painted with something?

i did that, it sticks but i am not  very good painter so it does not look brilliant.

But it does not look like a stainless steel chimney any more so hopefully will not get pinched

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Is it double skinned? No suggestions, but a double skinned chimney would keep the temperature lower and increase the paint possibilities. Or keep it unpainted. Stainless steel without paint has been used before.

Delorean_DMC-12_side.jpg.d8a8703bbe87f21aa593c66283d0f862.jpg

By Kevin Abato, www.grenexmedia.com - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=2447462

 

956px-Starship_SN15_liftoff_1.jpg.f5106b2b2ebd22c1623ed287b294f2ef.jpg

By Steve Jurvetson - https://www.flickr.com/photos/jurvetson/51160383711/, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=104990149

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In an engineering workshop course I attended many years ago I learned that stainess steel can corrode in damp conditions if the surface is not left  exposed to the open air, which is why stainless steel is often left unpainted. If you put a rubber ring around a stainless steel rod and immerse it in water, a groove will get etched under the band caused by local electrolytic corrosion.  A paint film that does not completely exclude moisture could have a similar effect. Possibly a chimney that is in regular use will be ok as the heat will drive off the moisture that would be needed for corrosion to take place under the paint where the surface was broken.

Edited by Ronaldo47
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I used high temperature black engine paint from Halfords.

Brush painted. Used on a new stainless engine exhaust chimney and to repaint an old mild steel one. Went on well, good finish and seems to be fairly robust in normal handling.

325043?w=1240&h=960&qlt=default&fmt=autohttps://www.halfords.com/motoring/paints-and-body-repair/specialist-and-decorative-paints/halfords-high-temperature-engine-enamel-paint---satin-black-250ml-325043.html

Edited by David Mack
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We have a double skinned stainless chimney too. Used the same paint as David Mac. I did however use metal etch primer for the first coat.

I wrapped the inner liner with exhaust wrap then filled the void with fire retardant expanding foam.

The outer skin barely gets warm. 
Had no issues with pealing paint.

As it is double skinned any gunk runs down inside the flue, not on the boat’s roof.

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16 hours ago, Ronaldo47 said:

In an engineering workshop course I attended many years ago I learned that stainess steel can corrode in damp conditions if the surface is not left  exposed to the open air, which is why stainless steel is often left unpainted. If you put a rubber ring around a stainless steel rod and immerse it in water, a groove will get etched under the band caused by local electrolytic corrosion.  A paint film that does not completely exclude moisture could have a similar effect. Possibly a chimney that is in regular use will be ok as the heat will drive off the moisture that would be needed for corrosion to take place under the paint where the surface was broken.

When I worked offshore we had to change all the stainless steel hydraulic pipework out as it started to fail under the Storf Clamp, mind you it had been there 20+ years

image.jpeg.eb75bd3900a1b481b88252daf3020544.jpeg

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