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Thread: black marks on gray plaster

  1. #1
    Junior Member
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    Sep 2010
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    black marks on gray plaster

    We just plastered a pool gray and something from a nearby tree seems to have fallen off, sort of small berry maybe? and stained the new plaster with little dark black streaks. Has anyone else run into this problem? And if so, any solutions to removing the stain?

  2. #2
    Senior Member In the Industry

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    Re: black marks on gray plaster

    Organic staining will go when you add the chlorinated water (bleach)

  3. #3
    Mod Squad Melt In The Sun's Avatar
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    Re: black marks on gray plaster

    I'm guessing mulberries? Those things are such a pain! Like teapot said, chlorine will remove the stains if that is indeed what they are.
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  4. #4
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    Re: black marks on gray plaster

    Are you certain it isn't black dye from the plaster? Was it there when they finished, or did they just appear?

    I have seen poorly mixed plaster trowel out with black streaks before, when it does not fully blend in the hopper and comes out the hose with dry pockets of color that gets troweled. Hopefully it is organic and will go away, but you may want to double check in case you need to call the PB/plasterer.

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