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  1. #1
    Join Date
    Jun 2018
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    Default Removing Mould from timber?

    Hi all,
    Hoping that the brains department can help me with a tried and proven way of mould removal without sanding!!
    This is on an old bread board as a result of a pot plant.
    Thanks in advance
    Matt


    Northern Beaches Sydney

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  3. #2
    Join Date
    Apr 2002
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    Brisbane
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    Default

    once wood has been mould marked, there is very little you can do ...... even sanding, is unlikley to get that out ... yo could bleach it .... but that will take colour out of the wood.
    Any thing with sharp teeth eats meat.
    Most powertools have sharp teeth.
    People are made of meat.
    Abrasives can be just as dangerous as a blade.....and 10 times more painfull.

  4. #3
    Join Date
    Jan 2014
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    Sydney Upper North Shore
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    Default

    Depends on whether you want to eat off it

    There are various timber deck cleaners that contain fungicides or there are mould removers that don’t contain bleach. Give the Bunnies website a trawl - there are a number of products there.

  5. #4
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    Jun 2018
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    Default

    Quote Originally Posted by Lappa View Post
    Depends on whether you want to eat off it

    There are various timber deck cleaners that contain fungicides or there are mould removers that dont contain bleach. Give the Bunnies website a trawl - there are a number of products there.
    Thanks for your response.
    No it wont be used for food in the future. Ill make a trip to Bunnings [emoji106]


    Northern Beaches Sydney

  6. #5
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    Default

    Yeh good luck with that on bare timber that is already stained with mould.
    Any thing with sharp teeth eats meat.
    Most powertools have sharp teeth.
    People are made of meat.
    Abrasives can be just as dangerous as a blade.....and 10 times more painfull.

  7. #6
    Join Date
    Jan 2014
    Location
    Sydney Upper North Shore
    Posts
    3,654

    Default

    Quote Originally Posted by soundman View Post
    Yeh good luck with that on bare timber that is already stained with mould.
    https://cabots.com.au/product/cabots-deck-clean

  8. #7
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    Brisbane
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    Default

    not bleach, it's acid and will have pretty much the same effect on colour.
    Any thing with sharp teeth eats meat.
    Most powertools have sharp teeth.
    People are made of meat.
    Abrasives can be just as dangerous as a blade.....and 10 times more painfull.

  9. #8
    Join Date
    Jun 2018
    Location
    Sydney
    Age
    47
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    137

    Default

    Thanks Lappa
    This looks like the way to go [emoji106][emoji106]


    Northern Beaches Sydney

  10. #9
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    lower eyre peninsular
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    2,454

    Default

    If you cant erase it, turn the whole situation around, I can the the 'shroud of Turin' or similar coming out here, make it a feature and put on youtube & ebay.
    Life expectancy would grow by leaps and bounds if green vegetables smelled as good as bacon.

  11. #10
    Join Date
    Feb 2006
    Location
    Perth
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    Default

    Cabot's deck cleaner is between 5 and 10% Oxalic acid which is a relatively weak organic acid and at that strength, provided its not left on wood for long periods it won't bleach the timber.

    I used oxalic acid on a tassie oak bench top to remove some black iron stains. What happened was I left the bench top exposed while I was grinding some steel and a some iron dust settled on the bench to and reacted with the tannins in the wood making the resulting stain. I left the acid on for about 30 minutes

    Pre oxalic acid use
    PreOA22.jpg
    After oxalic acid use and with a coat of BLO
    You can see it does not appear to have produced any significant bleaching.
    PostOA1.jpg

    FWIW I made up my own oxalic acid 10% solution from pure oxalic acid powder I got from work.
    Oxalic acid is toxic if sufficient is ingested but bearing in mind that many foods contain it (eg rhubarb) then this says you need to eat a lot to be affected.

  12. #11
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    iron stains on the surface are an entirely different problem to deep seated mould stains.
    In addition Tas Oak has little or no colour.
    Futhermore, you are showing us one picture with the stains and another that has been finished with product.
    Any thing with sharp teeth eats meat.
    Most powertools have sharp teeth.
    People are made of meat.
    Abrasives can be just as dangerous as a blade.....and 10 times more painfull.

  13. #12
    Join Date
    Feb 2006
    Location
    Perth
    Posts
    24,329

    Default

    Quote Originally Posted by soundman View Post
    iron stains on the surface are an entirely different problem to deep seated mould stains.
    Futhermore, you are showing us one picture with the stains and another that has been finished with product.
    If the stains were on the surface they would have sanded out which they didn't.
    Anyway you completely missed my main point - ie oxalic if used with care won't bleach wood to any noticeable degree.

    This is not the only time I have used oxalic - it was just the time I happened to have photos of the process.

  14. #13
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    Apr 2002
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    Brisbane
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    Default

    you have completely missed my point.

    pretty much nothing will remove deep molud stain without discolouring timber ... iron stain is not mould
    Any thing with sharp teeth eats meat.
    Most powertools have sharp teeth.
    People are made of meat.
    Abrasives can be just as dangerous as a blade.....and 10 times more painfull.

  15. #14
    Join Date
    Jun 2017
    Location
    Moorooka
    Posts
    51

    Default

    I bought very mouldy very smelly unused hardwood breadloaf from demo yard a few years ago when repairing a deck.
    We treated the wood with this The Flood Company Australia Anti-Mould Products mould_action
    I dont remember any staining from the mould but I do remember the mouldy smell was gone after we used the product three times. We painted the breadloaf once it was installed. I have used the same product on other painted surfaces, it did not remove all but most of the staining.




    Sent from my iPad using Tapatalk Pro

  16. #15
    Join Date
    Nov 2012
    Location
    Melb
    Posts
    993

    Default

    Use Nappisan as a source of oxalic acid, soak it for a short time, scrub it and once dried, plane it.

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