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Thread: Spar Varnish

  1. #1
    Join Date
    May 2008
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    Peshtigo,WI
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    Spar Varnish

    Does Spar Varnish ever dry as hard as regular poly or will it always be a little rubbery?
    I've never worked with Spar and am a little surprised at how rubbery it is.

    Oops just realized this post is in the wrong forum. Mods can you move it to the finishing forum?
    Last edited by Jerry Bruette; 08-19-2019 at 7:13 PM. Reason: Wrong Forum
    Confidence: The feeling you experience before you fully understand the situation

  2. #2
    Join Date
    Mar 2003
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    San Francisco, CA
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    8,760
    Spar varnish is formulated to be softer and more flexible than "normal" varnish. The idea is that it goes on wooden parts like masts on boats. In service, the parts may bend, which might crack a more-rigid finish.
    The wood is also exposed to wide humidity swings, and wide temperature swings, and those cause wood expansion and contraction. So again, a flexible varnish may last longer than a rigid one.

  3. #3
    Join Date
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    Tomball, TX (30 miles NNW Houston)
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    What is your project? Interior use an interior finish; exterior use a spar/marine outdoor finish.
    Scott

    Finishing is an 'Art & a Science'. Actually, it is a process. You must understand the properties and tendencies of the finish you are using. You must know the proper steps and techniques, then you must execute them properly.

  4. #4
    Join Date
    May 2008
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    Peshtigo,WI
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    818
    Hi Scott

    Long time no see. It was just a general question. I had replacement windows installed and spar varnish was recommended because of the UV inhibitors. I had never used spar before and noticed it was softer and more elastic.
    Confidence: The feeling you experience before you fully understand the situation

  5. #5
    Spar varnish doesn't get as hard as polyurethane but if yours is a little rubbery something is wrong. To the touch it would feel as hard as any finish. If too many coats were applied too fast it could make it feel soft until it hardens through. If that is the case it may crack. The product could be defective. What brand is it?

  6. #6
    Join Date
    May 2008
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    Peshtigo,WI
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    818
    Varathane brand.
    Confidence: The feeling you experience before you fully understand the situation

  7. #7
    Quote Originally Posted by Jerry Bruette View Post
    Varathane brand.
    Varathane Spar Urethane is not spar varnish.

  8. #8
    Quote Originally Posted by Randy Goodhew View Post
    Varathane Spar Urethane is not spar varnish.
    I've never seen it before. A spar urethane can be used the same as a spar varnish. I know the Helmsman spar urethane is junk but I wonder if the Varathane is a good finish or not.

  9. #9
    Join Date
    Feb 2019
    Location
    Averill Park NY
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    Quote Originally Posted by Edward Dyas View Post
    I've never seen it before. A spar urethane can be used the same as a spar varnish. I know the Helmsman spar urethane is junk but I wonder if the Varathane is a good finish or not.
    If you think Helmsman is junk. Donít ever buy the Varathane.
    Some Blue Tools
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  10. #10
    Join Date
    Mar 2014
    Location
    Los Angeles
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    593
    Clark, what brand of poly and spar varnishes do you like?

    thanks.

  11. #11
    Join Date
    Feb 2019
    Location
    Averill Park NY
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    80
    Quote Originally Posted by Mark Gibney View Post
    Clark, what brand of poly and spar varnishes do you like?

    thanks.
    Mark, I use the Helmsman. Really havenít had any issues with it.
    Some Blue Tools
    Some Yellow Tools
    And a Pet Grizzly
    ShapeokoXL
    Blue and White 50 Watt

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