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Old 08-10-2008, 06:25 PM   #1
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White dusty spots on dark blue wall!!!!!!!!!


Yeah recently I have noticed there are quite a few white dusty spots on my dark blue painted wall. This is something I have never seen before. This wall was painted dark blue over an existing painted wall about 6 years ago or so. I am hoping this is not mold. I was gonna try to spray 50 % water and 50 % bleach but I would think that would take the paint away from the wall. Any suggestions? Thanks.

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Old 08-10-2008, 07:47 PM   #2
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White dusty spots on dark blue wall!!!!!!!!!


Patsfan:

How big are those spots, and are they roughly uniform in size?

Do the spots tend to form in lines about 16 inches apart?

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Old 08-10-2008, 08:27 PM   #3
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White dusty spots on dark blue wall!!!!!!!!!


Here are a few pictures of what it looks like. It's all around the bedroom. I did wipe away an area and the white is gone however when the paint dries the paint appears lighter than the rest of the unaffected part of the wall. I think its mold. What is the best solution to remove it if it is mold?
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White dusty spots on dark blue wall!!!!!!!!!-wall-paint-003-medium-.jpg   White dusty spots on dark blue wall!!!!!!!!!-wall-paint-005-medium-.jpg   White dusty spots on dark blue wall!!!!!!!!!-wall-paint-008-medium-.jpg  

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Old 08-10-2008, 10:02 PM   #4
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White dusty spots on dark blue wall!!!!!!!!!


A store-bought mildecide like X-14 or Moldex, or a home-made 50/50 bleach/water mix

I'm assuming that's Patriot Blue?

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Old 08-10-2008, 10:18 PM   #5
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White dusty spots on dark blue wall!!!!!!!!!


LOL It is actually called Starry Night Blue. Close enough lol. So did you look at the pics and do you think it is mold? Anyhow I do have something called Soilax. Does this mean I will have to paint the whole room again after I KILL the mold?
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Old 08-10-2008, 10:53 PM   #6
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White dusty spots on dark blue wall!!!!!!!!!


I kinda doubt that's mold. Except for the third picture, there are too many straight and curved lines in the "growth pattern" for it to appear natural. But, just cuz I ain't seen nuthin like that before, don't mean squat.

You said: "I did wipe away an area and the white is gone however when the paint dries the paint appears lighter than the rest of the unaffected part of the wall."

That very well could be because you simply didn't remove that whiteness completely.

Try this:

Using a Magic Eraser (No Name equivalent is fine) re-clean half of the area you cleaned with ordinary tap water and the other half with a bleach solution. (Check a 10% bleach solution in an inconspicuous area first and see if it harms your paint. It shouldn't. If it doesn't, try bleach straight of the jug on that inconspicuous area. Clean half the area previously cleaned with the Magic Eraser and ordinary tap water an the other half with the strongest concentration of bleach you've determined won't harm your paint.

Using bleach on one area and water on another will tell us whether or not it's alive cuz the bleach will kill any mold or mildew.

Using a Magic Eraser to clean the wall will tell us whether or not the whitish colour that returned after the first cleaning was just due to not getting all of the white stuff off the first time.

PS:
(Bleach shouldn't discolour your paint because the colour in it comes from tiny blue particles (called "pigments") that are suspended inside the paint film much like raisins in raisin bread. So, those blue particles are encased in plastic and don't actually come in contact with the bleach. But, confirm in an inconspicuous area just to be certain.)

When you cleaned the first time, what did you clean with? Soap, water, bleach, using a rag, sponge, brush, what?

Last edited by Nestor_Kelebay; 08-10-2008 at 11:23 PM.
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Old 08-11-2008, 02:38 AM   #7
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White dusty spots on dark blue wall!!!!!!!!!


I just used a damp old wash cloth and water. It looks like the part I scrubbed off is gone. I am baffled on what the white spots are cause its on every wall in the bedroom. Could it be dust build up?
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Old 08-11-2008, 08:28 AM   #8
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White dusty spots on dark blue wall!!!!!!!!!


No, dust would accumulate more uniformly.

Who's bedroom is it? Yours or your kids?
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Old 08-11-2008, 02:59 PM   #9
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White dusty spots on dark blue wall!!!!!!!!!


It doesn't look like common traditional mold
But it could be that white, wispy, light and fluffy, "basement" mold we see around here
It's hard to say from here

You should not have to re-paint after using a mildecide, but that could depend on your paint
It wouldn't be an issue with a good paint, but cheaper paints may not hold up to it

Also, some cleaners such as TSP (Spic and Span, some commercial surface and mildew cleaners, and the ever popular homemade Bleach/TSP/Water mix), and some tools (such as the Mr. Clean Magic Eraser) will slightly de-gloss most gloss finishes, and shouldn't be used on gloss painted surfaces unless re-painting (and in that case the de-glossing is a plus)
The product or tool will be labeled to that effect somewhere in the fine print
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Old 08-13-2008, 12:39 AM   #10
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White dusty spots on dark blue wall!!!!!!!!!


I wouldn't play around, to be sure i'd cut a layer of the paper and see if their is more mold issues between the coating and the Sheetrock and the paper and the rock. The more you mess with mold more the chance you can get sick. Once you mess with mold it starts releasing spores through out the house. Some painter belive to kill mold you need the 50 50 salution. After being schooled on mold I came to find that you cant kill mold. You would need cut the infected areas out if their more between the coatings.
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Old 08-13-2008, 02:29 AM   #11
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White dusty spots on dark blue wall!!!!!!!!!


Quote:
Originally Posted by EPI View Post
I wouldn't play around, to be sure i'd cut a layer of the paper and see if their is more mold issues between the coating and the Sheetrock and the paper and the rock. The more you mess with mold more the chance you can get sick. Once you mess with mold it starts releasing spores through out the house. Some painter belive to kill mold you need the 50 50 salution. After being schooled on mold I came to find that you cant kill mold. You would need cut the infected areas out if their more between the coatings.
Don't get me wrong, I'm not trying to be beligerant. We value experienced advice in here. The point of these forums is to help new homeowners figure out what's causing the problems they're having. But, when apparantly knowledgeable people all propose different reasons, about the only way the newbie has of determining which ones are plausible are by running them all through a "reality filter". That is, to carefully consider each alternative explanation for the problem and see whether or not it jives with the reality of the situation or not.

Specifically, I think the two statements you made that wouldn't pass through the reality filter are:

A) checking to see if there's mold between the paint and the sheetrock paper, and between the paper and the gypsum, because of the possibility that the white stuff came through the wall, and

B) not being able to kill mold.

If the original poster can clean that white discolouration off the blue paint so that there's no visible evidence of it anymore, and the previously affected area now looks just like the unaffected areas, wouldn't that prove that the white discolouration was deposited on the paint from outside rather than having come through the drywall, primer and paint to accumulate on the surface of the wall? That is, if the mold is white, and it passed through a layer of clear plastic with blue pigments inside it (the paint), wouldn't there still be some white "mold" particles still in that clear plastic film that would give it a whitish discoloration? That is, the white "molds" still in the paint film would act the same as white pigments to effectively whiten the colour of the blue paint, making it a "light blue" colour instead. If cleaning the paint film with bleach were to make those white "molds" clear, then wouldn't that bleach also affect the colour of the blue pigments inside the paint film, too? So, wouldn't the apparant lack of any discolouration of the paint film after cleaning prove that the mold didn't come through the paint film?

And, about killing mold...

When I clean a dirty wall with bleach, I get dirt accumulating on the damp rag or sponge I'm using, and the cleaning water I use gradually gets dirty. However, when I clean mildew off of a painted bathroom wall or ceiling, I don't see the sponge or rag turning dark, or any substantial change in colour of the bleach solution I'm using. If it's not possible to kill mold, then what I appear to be doing is only changing it's colour from black to clear. It seems to me that if I didn't kill the mold, I would soon see mold growing on the wet rag or sponge I used to do the cleaning with. I've cleaned mildew off many bathroom walls, and have never subsequently seen heavy mildew growth on the cleaning rag or sponge used to do the cleaning. In fact, I believe that if I used a cotton rag to do the cleaning, rinsed it out and put it in a plastic bag so that it wouldn't dry, mold wouldn't grow on it any sooner than a clean wet cotton rag under the same conditions. So, if the bleach on the rag didn't kill the mildew and it's spores, why doesn't the wet cotton cleaning rag become a growth media for mildew?

Last edited by Nestor_Kelebay; 08-13-2008 at 11:42 AM.
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Old 08-13-2008, 11:35 AM   #12
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White dusty spots on dark blue wall!!!!!!!!!


I just thought I would toss in that if it is mold, merely killing what is on there is the least of your problems. Mold is caused by excess moisture. If you don't stop the moisture, it will either: A) Grow back. or B) Even worse, grow somwhere where you can't see it, but it is still very bad for you.

Is this room damp at all? Judging from your pictures, this looks like a bonus room or other room with no attic overhead. Perhaps you have a roof leak, but it is soaking your insulation instead of dripping on your wallboard, which means no obvious water stains. Maybe a couple pokes with a cheap moisture meter would answer this question without having to destroy your wall.

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Old 08-13-2008, 12:36 PM   #13
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White dusty spots on dark blue wall!!!!!!!!!


I had an instance where mold was coming through the paper to the surface and when I peeled a layer back

All I am saying is your telling a DIY to do all this stuff with it and your not sure if it is mold, alkaline or what ever. If it is mold you don't even know what degree it is. The more you mess with mold without taking care of the it. more the spores get around you living space. Which gives the pepole living in it more of a chance of getting sick. If you have mold on your substraight there is a chance that mold is in your wall. There was an area in the picture where it looked like the paint was blistering.

As far as killing mold, I,m talk about mold at it full degree. shower rooms that collect resadue just need to be maintained, and yes that can be taken care of a 50 50 salution. But the real deal you can not kill it, that just the way it is. I had it explain to me like this, if the dog craped on your floor and all you do is spray it with the smell good stuff and didnt clean it up. The air smells good but the crap is sill there. That is exactly what your doing when your one is trying to kill mold.
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Old 02-18-2011, 12:50 PM   #14
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White dusty spots on dark blue wall!!!!!!!!!


I'm trying to reach Patsan... original author as I'm having the exact same problem on my wall and I'm wondering if they found the answer. A mold expert doesn't think mine is mold, and a paint expert is baffled and suggesetd getting a sample to the lab as he thinks there is definately some sort of reaction happening in the room.
Thank you
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Old 02-18-2011, 12:53 PM   #15
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White dusty spots on dark blue wall!!!!!!!!!


I don't know if this is going to Patsan but I'm trying to find out if you ever found out what the white on your walls was from. I'm having the exact same problem.... mold guy doesn't think it's mold; paint guy has no clue other than to cut some wall out and take it to the lab.

Any info. you have is appreciated.

Thanks

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