Results 1 to 7 of 7

Thread: Spar Varnish

  1. #1
    Join Date
    May 2008
    Location
    Peshtigo,WI
    Posts
    811

    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 6:13 PM. Reason: Wrong Forum
    Confidence: The feeling you experience before you fully understand the situation

  2. #2
    Join Date
    Mar 2003
    Location
    San Francisco, CA
    Posts
    8,672
    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
    Jul 2008
    Location
    Tomball, TX (30 miles NNW Houston)
    Posts
    2,721
    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
    Location
    Peshtigo,WI
    Posts
    811
    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
    Location
    Peshtigo,WI
    Posts
    811
    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.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •