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Removing watermarks (I think) from sapelle

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  • 27-01-2019 11:51pm
    #1
    seannash
    Registered Users Posts: 5,672 ✭✭✭


    Hi, I have an old school lab countertop which I've began sanding. I've encountered some marks and I'm not sure how to get rid of them.
    Any advice would be appreciated.


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    #2
    magicbastarder
    Moderators, Category Moderators, Arts Moderators, Sports Moderators Posts: 48,509 CMod ✭✭✭✭magicbastarder


    if they came from a lab, there's a good chance that's not water - could be chemical or oil stains?


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    #3
    seannash
    Registered Users Posts: 5,672 ✭✭✭seannash


    magicbastarder wrote: »
    if they came from a lab, there's a good chance that's not water - could be chemical or oil stains?

    Your right!!
    Could definitely be something other than water. Any advice?. I tried sanding but they are deep


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    #4
    dathi
    Registered Users Posts: 1,386 ✭✭✭dathi


    https://www.ebay.co.uk/itm/500g-Oxalic-acid-Hull-Deck-GRP-Cleaner-rust-remover/140426948733?epid=1125002887&hash=item20b219307d:g:OeYAAOSwrklVACWE:rk:2:pf:1&frcectupt=true


    looks more like iroko than sapelle you can use oxalic acid to remove the stains from timber you mix about two teaspoons in 500mls boiling water and brush it on leave to dry or use heat gun to dry quicker may take several goes to remove stain rinse the wood well with clean water after . make sure you are using rubber gloves and mask as it is toxic


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    #5
    seannash
    Registered Users Posts: 5,672 ✭✭✭seannash


    dathi wrote: »
    https://www.ebay.co.uk/itm/500g-Oxalic-acid-Hull-Deck-GRP-Cleaner-rust-remover/140426948733?epid=1125002887&hash=item20b219307d:g:OeYAAOSwrklVACWE:rk:2:pf:1&frcectupt=true


    looks more like iroko than sapelle you can use oxalic acid to remove the stains from timber you mix about two teaspoons in 500mls boiling water and brush it on leave to dry or use heat gun to dry quicker may take several goes to remove stain rinse the wood well with clean water after . make sure you are using rubber gloves and mask as it is toxic
    Thanks for that, I'll give that a go.
    And your right it could be Iroko alright. I was told it was either that or sapelle but as it had a dark stain on it I couldn't tell.


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    #6
    recipio
    Registered Users Posts: 2,804 ✭✭✭recipio


    Pour some meths on them and set them alight. If they are oil based they will burn off. Otherwise oxalic acid is effective, especially on ink stains.


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    #7
    kadman
    Moderators, Home & Garden Moderators Posts: 5,065 Mod ✭✭✭✭kadman


    Head the warning on Oxalic Acid, its a deadly poison,
    https://medlineplus.gov/ency/article/002479.htm
    Poisonous Ingredient

    Oxalic acid
    Where Found

    Oxalic acid may be found in some:

    Anti-rust products
    Bleaches
    Metal cleaners
    Rhubarb leaves

    Note: This list may not be all inclusive.
    Symptoms

    Symptoms of oxalic acid poisoning include:

    Abdominal pain
    Burns and blisters where the acid contacted the skin, lips, tongue, and gums
    Collapse
    Convulsions
    Mouth pain
    Shock
    Throat pain
    Tremors (unintentional trembling)
    Vomiting

    Home Care

    Seek immediate medical help. DO NOT make a person throw up unless told to do so by Poison Control or a health care professional.

    If the chemical was swallowed, immediately give the person water or milk, unless instructed otherwise by a health care provider. DO NOT give water or milk if the person is having symptoms (such as vomiting, convulsions, or a decreased level of alertness) that make it hard to swallow.
    Before Calling Emergency

    The following information is helpful for emergency assistance:

    Person's age, weight, and condition
    Name of the product (ingredients and strengths, if known)
    Time it was swallowed
    Amount swallowed

    However, DO NOT delay calling for help if this information is not immediately available.
    Poison Control


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    #8
    magicbastarder
    Moderators, Category Moderators, Arts Moderators, Sports Moderators Posts: 48,509 CMod ✭✭✭✭magicbastarder


    the acid in rhubarb is oxalic acid, maybe rub some rhubarb on it?


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    #9
    Esel
    Registered Users Posts: 22,035 ✭✭✭✭Esel


    magicbastarder wrote: »
    the acid in rhubarb is oxalic acid, maybe rub some rhubarb on it?
    I know you meant rhubarb leaf. :)

    Not your ornery onager



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    #10
    seannash
    Registered Users Posts: 5,672 ✭✭✭seannash


    Thanks everyone for the replies. I've ordered some oxalic acid so hopefully that will shift the stain.
    Perhaps he can help me with something else.
    I've sanded down the countertop but I feel I've hit a wall where it won't sand anymore unless I apply a good bit of pressure.
    I'm fearful I'm digging in too much.
    Can I ask if from these pictures you can tell if I'm back to bare wood or if I've a way to go.


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