Rust Stains on Chimney Crown

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Old 07-14-15, 01:34 PM
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Rust Stains on Chimney Crown

Hi all,
We had our chimney crown replaced a year ago and sealed with crown
seal. There are 2 flues exiting the crown; a fireplace flue in good condition but unused and a oil furnace flue (stainless steel liner).
The problem is with the oil furnace flue. There is a cap on the flue (stainless I am told). There appears to be what looks like rust coming from the flue pipe and running over the top of the crown and down the sides of the brick chimney. There is also a small circle of what looks to be sulphur (yellowish powder) surrounding the flue pipe.
In addition, the crown sealer has now peeled like a cheap paint off the masonry
crown causing a real mess.
Can anyone give me an idea as to what is causing this?
Thanks
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Old 07-14-15, 01:38 PM
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It could be Chinese stainless steel which I have seen rust on kitchen products. Until now, I thought that stainless meant stainless not anymore.
 
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Old 07-14-15, 06:15 PM
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If just the cap on the flue pipe was cheap stainless would that cause it? What about the sulphur looking powder. If it was acidic could this have caused the sealant to peel?
 
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Old 07-14-15, 06:28 PM
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Here's what someone on Yahoo has to say about it.

https://answers.yahoo.com/question/i...5121504AAUI6N4
 
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