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Old 02-18-2011, 08:18 PM   #16
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White dusty spots on dark blue wall!!!!!!!!!


Gail, are your spots on the outside walls only, meaning the walls that separate outside from inside, not the walls that separate rooms? Are your walls plaster or sheetrock? Is your house stone, brick, or other masonary type of finish? I've read this thread and I think it's mildew, but I'm trying to rule out any possible moisture transfer through the walls from outside.

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Old 10-18-2011, 06:22 AM   #17
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White dusty spots on dark blue wall!!!!!!!!!


Having the same problem! There are many round spots which are about 5 inches wide. They are almost in a patter. I am able to rub it off with my finger. Have it in two bedrooms. Calling a mold guy to check it out. I'm glad there are darker colors in the rooms, because if it is mold, I probably never would have noticed it.
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Old 10-18-2011, 10:07 AM   #18
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White dusty spots on dark blue wall!!!!!!!!!


I actually had a mold person take a look and it was not mold. I sent a sample of the wall to a lab (per my County Health Dept) and they said it was not bacterial. They advised me to call my ins. co. which did. They looked and were stumped and actually called and hired HSA Engineers & Scientists to come over and investigate (which they paid for). The engineer drove 4 hours to get here; spent 3 hours at my home conducting extensive tests and determined the following: The white powder was consistent with 1 of 3 reasons: 1. excess pigment extenders in paint, 2. frosting, and 3. chalking. So...... I wiped it off all the walls and am waiting to see if it comes back.... so far so good; it's been since May 2011 and the walls look o.k. Good luck!
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Old 10-18-2011, 04:18 PM   #19
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White dusty spots on dark blue wall!!!!!!!!!


Were your spots circular? The pattern almost looks like drywall after you spackle and are ready to paint. I have somebody coming tomorrow. I am also going to get a second opinion. I will let you know what happens. I hope its the same thing you have. Thanks for replying.
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Old 10-18-2011, 04:45 PM   #20
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White dusty spots on dark blue wall!!!!!!!!!


No, they were not circular; they were irregular and sporadic across the entire wall... sounds like it's not the same thing.
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Old 10-18-2011, 05:05 PM   #21
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White dusty spots on dark blue wall!!!!!!!!!


Frosting... as in cake? Lol.
Food fight, there's your answer!
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Old 10-18-2011, 06:03 PM   #22
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White dusty spots on dark blue wall!!!!!!!!!


Yes, what is frosting?
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Old 10-19-2011, 03:21 AM   #23
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White dusty spots on dark blue wall!!!!!!!!!


I was gonna ask also but am glad to know I am not the only dumb one here
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Old 10-22-2011, 05:27 PM   #24
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White dusty spots on dark blue wall!!!!!!!!!


Having the same problem...philipsburg blue from Benjamin Moore...wondering if it's the blue color that caused the problem. So I wiped the dust away last year and now it's back again. What stops it???
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Old 10-22-2011, 05:29 PM   #25
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White dusty spots on dark blue wall!!!!!!!!!


Wiped mine away and then it came back again within a year. What can be used to make it go away forever?
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Old 10-30-2011, 09:46 AM   #26
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White dusty spots on dark blue wall!!!!!!!!!


I am having the same problem not blue but taupe color however it is from Benjamin Moore. I have washed these walls with everything I can think of but nothing works. The spots are identical to the pics. I have had it tested for mold and moisture in the room ...None.
I would like to know if the washing worked and with what product.......
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Old 10-30-2011, 07:41 PM   #27
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White dusty spots on dark blue wall!!!!!!!!!


I have tried wiping with a damp cloth, wiping with fantastik, wiping with 409. It all takes the marks away temporarily. Last wiping lasted 2 months but it always seems to come back.

Just a side note, I used benjamin moore too. Maybe I will try to contact them, now that we have shared a similar manufacturer. Maybe they are familiar with the problem.

Keep me posted if you find out anything.
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Old 10-31-2011, 07:33 AM   #28
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White dusty spots on dark blue wall!!!!!!!!!


I just washed my walls again using TSP last night. So will see. I think I will call a paint distributor and ask about this.
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Old 10-31-2011, 09:18 AM   #29
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White dusty spots on dark blue wall!!!!!!!!!


I'm gonna step out on a limb here, but I'm pretty certain this is not mold or mildew you're dealing with. And, for the record, it's impossible to say, with certainty, what the problem is just from these pictures. My personal guess, is one of a couple things. #1 is efflorescence. Efflorescence is often times seen on bare or painted masonry or cementitious surfaces (concrete, plaster, plasterboard, patching plaster, etc.). Efflorescence are soluble salts, brought to the surface via moisture or vapor transmission. This moisture may come from a damp wall or simply from the application of paint itself. Efflorescence may show up as a white stain or haze, or even as a thick, crystallized, powdery, chalky, dusty clump on the wall. Treating efflorescence is fairly simple (although if it is caused by moisture from a damp wall, that needs a different kind of attention). To begin, it may not be a bad idea to lightly scuff-sand affected area to break through paint film. To treat, mix a 50/50 solution of white vinegar and water and spray onto affected areas with a spritzer bottle - then allow to sit a few minutes. During this time, you may or may not see the white deposits effervescing - if so, wait a few minutes and repeat until the bubbling stops. Wipe affected area with a damp sponge, then rinse the area with clean water to neutralize..Allow to dry, then repaint.

#2 - May be paint frosting. If this is the case, the treatment may be a little more involved. Frosting is usually seen on tinted paint, often times in darker colors (only because the frosting isn't as visible on whites and lighter colors), and is the result of tinting bases containing calcium carbonate as an extender pigment (calcium carbonate is a common extender pigment used in most latex paints). The frosting may occur for a number of reasons - paint has too great a cc load relative to the amount of resin, atmospheric conditions at time of application, extreme temperature shifts during dry and/or curing time, humidity, etc. Frosting may be easily removed by just washing with clean water...and hopefully that'll be the extent of it. If it's more stubborn than that, do not paint over it thinking that'll take care of the problem - chances are, it'll bleed through an additional coat(s) of paint. In extreme cases (and I don't think we're dealing with that here), it could actually have an impact on adhesion of subsequent coats of paint applied. If the case is extreme and can't be simply washed off, it'd be a good idea to lightly scuff-sand the affected area, then prime with resinous, masonry type conditioner before applying finish paint.

Finally, if this were mold - don't panic - you already know the treatment for mold. Mold is not some sinister entity with evil intent. It is simply plant life - and it can be killed. The difficulty is the fact that what you see is not necessarily the extent of mildew. If mildew is in previous layers of paint, or underneath wall covering, and all you do is treat the surface - it may not be that successful. We live with, and breathe in, airborne mildew spores constantly - some people have allergic reactions to it, most don't. Mold, like all plant life, needs certain things to grow and colonize. Mold doesn't do as well in sunny or dry areas, so damp and dark areas should be monitored...Mold also needs a food source - which can be anything organic. Sometimes paint contributes to the food source - alkyd paints have an organic element that mold and mildew feed on - latex, specifically acrylics, not so much, but any paint tinted with organic colorants may provide food source...some organic cleaning compounds leave a residue that may be food source. When cleaning a surface affected by mildew, it's recommended that a bleach and water solution mixed into a detergent is usually appropriate. Stay with non-sudsing detergents such as Soilax or Dirtex Powder...Detergents like TSP, contains phosphates which is a fertilizer to plant life. Without adequate and proper rinsing to remove any detergent residue, TSP could actually create more of a problem.

I hope this info is more helpful than confusing, let us know what happens.

Last edited by ric knows paint; 10-31-2011 at 09:48 AM. Reason: syntax
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Old 10-31-2011, 04:37 PM   #30
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White dusty spots on dark blue wall!!!!!!!!!


Thanks ric knows paint
I am going with not mould as I had the room tested for this. No moisture on the walls or ceiling. The mould test came back negative. However they did find high RH so I bought a de-humidifier but not much water accumulated within 24hrs so thinking it is not that bad. I have cleaned with TSP yesterday and see what happens as I have tried everything else including bleach, and different type of cleaners. This started quite a few years ago and have since repainted and it did bleed through. If the TSP does not work will try the vinegar solution and perhaps scuff-sanding? I am assuming this means lightly sanding to give it some roughness for new paint to adhere to and your suggested primer.
Thanks again

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