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Thread: Milky finish

  1. #1
    Join Date
    Aug 2008
    Location
    moonta bay s.a.
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    32

    Default Milky finish

    Hi just finished putting the third and final coat of Botecoat to my strip canoe
    all the other coats went just fine up till the final that has now got this milky look
    in patchs what did i do wrong ?
    Is the high humitity /lot of rain yesterday got somthing to do with the problem
    and will it sand out? any help with this problem?

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  3. #2
    Join Date
    Jul 2005
    Location
    'Delaide, Australia
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    65
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    8,138

    Default

    Yes,

    Probably there is some moisture in the epoxy from condensation or direct drops of water or from water left in the brush.

    You can sometimes get it to disappear by warming up the epoxy with a hot air gun - BUT YOU HAVE TO BE REALLY CAREFUL

    Keep the air gun moving - waving backwards and forwards and touch the surface with your hand from time to time .. if it gets hot for your hand it is getting close to being too hot for the epoxy too.

    There is probably little chance of it completely disappearing, but it was a moisture problem.

    MIK

  4. #3
    Join Date
    Aug 2008
    Location
    moonta bay s.a.
    Posts
    32

    Default milky finish

    Thanks Mik for that info
    N.T. just had a tropical low pass our door step and dump 260mm
    in two days and this dope decides this is the time to apply epoxy
    well its back to the sanding and waiting for a better day
    once again thanks

  5. #4
    Join Date
    Jul 2005
    Location
    'Delaide, Australia
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    Default

    I did mean you can try the hot air gun (or a blow dryer now). Sometimes it can get a lot of it out. But make sure you don't get it too hot.

    It can be a bit risky using hot air guns much on freshly applied epoxy as it makes the epoxy run and can heat the timber up so much that it forces air bubbles out.

    MIK

  6. #5
    Join Date
    Dec 2007
    Location
    tasmania
    Posts
    13

    Default

    Simply wipe with thinners, will remove blush

  7. #6
    Join Date
    Jul 2005
    Location
    'Delaide, Australia
    Age
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    8,138

    Default

    Howdy,

    Good point Al, It would be good to double check to see if it is on the surface before getting excited about sanding off the finish.

    Sounds like classic moisture problems though.

    Water is the solvent for the amine blush/bloom/wax, so that makes it nice and cheap. Some say that a little bit of cloudy ammonia in the water helps, but the newer version of the WEST system book says that is not necessary.

    The nice thing about water is that it is cheap - so you can use enough to wash it off the surface. With thinners there is a tendency to just go over it with one cloth (to save money) which may simply redistribute the bloom/blush/wax over the surface.
    Best wishes
    Michael

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