blackrose Posted July 30, 2021 Report Share Posted July 30, 2021 What would you use to paint a stainless chimney? Key it and spray it with stove paint, or something else? I'm not sure how well stove spray paint stands up to rain and weather. Link to comment Share on other sites More sharing options...
dmr Posted July 30, 2021 Report Share Posted July 30, 2021 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. Link to comment Share on other sites More sharing options...
blackrose Posted July 30, 2021 Author Report Share Posted July 30, 2021 (edited) 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? Edited July 30, 2021 by blackrose Link to comment Share on other sites More sharing options...
Tonka Posted July 30, 2021 Report Share Posted July 30, 2021 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 Link to comment Share on other sites More sharing options...
Jen-in-Wellies Posted July 30, 2021 Report Share Posted July 30, 2021 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. By Kevin Abato, www.grenexmedia.com - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=2447462 By Steve Jurvetson - https://www.flickr.com/photos/jurvetson/51160383711/, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=104990149 Link to comment Share on other sites More sharing options...
blackrose Posted July 30, 2021 Author Report Share Posted July 30, 2021 It's single skinned and been painted from new more than 10 years ago but the paint is starting to peel. Link to comment Share on other sites More sharing options...
Ronaldo47 Posted July 30, 2021 Report Share Posted July 30, 2021 (edited) 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 July 30, 2021 by Ronaldo47 Link to comment Share on other sites More sharing options...
David Mack Posted July 30, 2021 Report Share Posted July 30, 2021 (edited) 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. https://www.halfords.com/motoring/paints-and-body-repair/specialist-and-decorative-paints/halfords-high-temperature-engine-enamel-paint---satin-black-250ml-325043.html Edited July 30, 2021 by David Mack Link to comment Share on other sites More sharing options...
Ray T Posted July 31, 2021 Report Share Posted July 31, 2021 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. Link to comment Share on other sites More sharing options...
ditchcrawler Posted July 31, 2021 Report Share Posted July 31, 2021 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 Link to comment Share on other sites More sharing options...
Machpoint005 Posted July 31, 2021 Report Share Posted July 31, 2021 I must admit I tend to regard chimneys as consumable items -- which they are, if they ain't stainless! Link to comment Share on other sites More sharing options...
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