Minwax Spar Urethane 3rd has serious white haze : help H2O

Discussion in 'Building Construction' started by bent, Aug 14, 2004.

  1. bent

    bent Guest

    Pine outdoor picnic table:

    The 2nd coat had a little bit of white haze, and I assumed it was because it
    rained on it a few hours. So I sanded, washed, recoated, and I think it
    would have been ok. But, the humitity was very high - for the 3rd coat. I
    could see a mist building as it dried.
    This morning, after the 3rd has "dried" it is white - almost as if I had
    white paint in the mix. Now I still asssume I can fix it. I assume the 3rd
    would have been fine if not for the humidity.

    What is the right thing to do:

    rubbing compound, steel wool, sandpaper?

    The original fix was a combination of sanding, washing, recoating. But I
    do not want to keep recoating.
    bent, Aug 14, 2004
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  2. bent

    Phil Scott Guest

    Outdoor in the rain on a horizontal surface with soft wood
    like pine is virtually impossible. if water sits on the
    surface..if water runs off because the surface is at a slight
    angle then there is some faint hope...but not for long with
    any of the oil based materials you are talking about.

    I think you will do modestly better with "Diamond Hard" a
    water based outdoor rated wood finish... I put three coats on
    a yellow ballau deck a year ago and most of it still still
    looks like new...some of the boards have soaked water through
    in spots and some grey is starting to show up... no lasting
    white spots.

    There is probably not a solution to your current dillema other
    than to strip and refinish...if you want the best outdoor
    finish try 'sun frog' an oil, it takes a while to dry, you
    recoat the table ever two years or so and it will look great

    The problem with finishes that dry hard over wood that expands
    and contracts in the humidiy and sun is that the finish
    delaminates from the wood... and as you noticed water gets
    under it via permeation and causes the finish to turn white.

    Thinner is better sometimes..

    Phil Scott
    Phil Scott, Aug 15, 2004
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  3. bent

    bent Guest

    hoping for more info; going to see
    15 yr old table; 40 coats of same material: never before this prob. Always
    been good
    bent, Aug 15, 2004
  4. bent

    Phil Scott Guest

    40 coats of varnish would be nearly an 1/8th of an inch
    thick.... sounds like smoke. you need about 3 days drying
    time between coats or it never dries if you go beyond 3
    coats... 3 coats is a practical maximum for that
    material...you can stretch it though with 3+ days drying time
    between coats if the relative humidity is under 60% or
    so...forget it if it is over 80%...... serving no really
    useful purpose though.

    also none of these materials is made to work over anything
    but real dry wood.. any moisture is the kiss of death to those
    applications, that caused the finish to turn white in your

    With laquer, hand rubbed you might see 20 coats of on some
    jobs...or actually an unlimited number of coats. Not with
    any of the varnishes though in particular... some urethanes
    you can get more coats with less drying time if you an

    Some tables get flooded with acrylic resin though, a dam is
    built around the table then the resin is poured on it to
    achieve whatever thickness you want...and a dead flat flawless
    finish without much effort.

    ....that would hold up against water in the outdoors.

    You may wish to call the manufacturer of your product and ask
    how it will hold up on a flat surface in the rain..also ask
    about the maximum number or coats before problems develop.

    Phil Scott , who made $45,000 one time touching up the wood
    work in a 300 room hotel... $1,500 per day. .. took 30
    days...about 6 hours a day.

    Never repeated that trick though. For a while I thought I had
    struck the mothah lode.
    I did develop my own magical almost instantaneous drying low
    odor finish though.. a real tricky little combination of
    products. and with that able to achieve some nice stain and
    dye effects.
    Phil Scott, Aug 15, 2004
  5. bent

    bent Guest

    that was quick math (wrong)
    12 yr old table; 3 coats stripped ~ every other year.
    block wet 400, rubbing compound - better, not gone. its like glass though -
    what a diff!
    i'll be back
    bent, Aug 15, 2004
  6. bent

    jj's woodworks

    Jan 9, 2017
    Likes Received:
    finished picnic table with spar urethane-weather very moist-had milky white surface when it dried-solution :spray on shellac-worked great!
    jj's woodworks, Jan 9, 2017
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