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Thread: black marks on gray plaster

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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?

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    In the Industry

    Join Date
    Jul 2009
    London and France

    Re: black marks on gray plaster

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

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    Melt In The Sun's Avatar
    Join Date
    Oct 2009
    Tucson, AZ

    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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    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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