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Old 03-01-2008, 02:46 PM   #1
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Shadows, like someone burned a candle in paint.


Hello,

I have a problem with paint that has shadows in it. The shadows look like candle stains, you know like when you put a candle too close to something and it leaves a black residue. The shadows start at the bottom above the forced hot water baseboards and go up as well as starting at the top of the door. I seem to remember reading many years ago that this is caused by air in filtration? The paint was applied to new construction, blueboard with a queens coat of plaster. The paint is a few years old now and needs covering. Is there a way to prevent these stains from reoccurring?

Thanks in Advance

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Old 03-01-2008, 08:07 PM   #2
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Shadows, like someone burned a candle in paint.


FIX the furnace. that is soot. after furnace is fixed then scrub walls, KILZ then re paint

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Old 03-03-2008, 08:05 AM   #3
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Shadows, like someone burned a candle in paint.


I wasn't clear, the baseboard is just hot water pipes with fins for heating the area. The furnace isn't even in the same physical space. The paint problems are in an in-law apartment over the garage. The furnace is in the basement of the main house. They are at least 40 linear feet apart, let alone 2 floors apart. There are 5 zones on the furnace, main house 1st floor, main house 2nd floor, main house master bedroom, hot water storage and the apartment. The only area that has the issue is the apartment which is located furthest from furnace.

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Old 03-03-2008, 08:07 AM   #4
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Shadows, like someone burned a candle in paint.


...I have scrubbed the walls twice and the marks are still there.
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Old 03-03-2008, 09:23 AM   #5
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Shadows, like someone burned a candle in paint.


I'm going to go way out on a limb here so be polite and don't laugh out loud but is it possible that you're seeing mildew stains? The area is plaster - an organic substance - and it's right there close by forced hot water in tubes which at some point cool down, perhaps causing a condensation around the area with the pipes which then creates a moist but warm area. The process is repeated numerous times a day and since it's over a garage, the cooldown is probably rapid. Possible?
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Old 03-03-2008, 07:00 PM   #6
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Shadows, like someone burned a candle in paint.


Quote:
Originally Posted by cjharris02892 View Post
I wasn't clear, the baseboard is just hot water pipes with fins for heating the area. The furnace isn't even in the same physical space. ....The only area that has the issue is the apartment which is located furthest from furnace.
I believe that would be a boiler rather than a furnace, and it does sound like blow-back...if it were a furnace
...and the blow-back could come up some distance from the furnace

But it sounds like you have a boiler
As far as I know, those don't have blow-back like furnaces
But I'm no expert on that sort of thing
You might want to ask in HVAC if is possible, just to be on the safe side

If it is blow-back...or it sounds like they are pretty tenacious even if it isn't, the stains will need to be sealed with a pigmented shellac, and then re-painted

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