To fiberglass or not ??

Discussion in 'Wooden Boat Building and Restoration' started by Archie1979, Apr 16, 2009.

  1. Archie1979
    Joined: Oct 2007
    Posts: 57
    Likes: 1, Points: 0, Legacy Rep: 36
    Location: Sydney

    Archie1979 Junior Member

    Hi Everyone,
    I am just about to start my epoxy work on the Qualia which was the mercury you can see it on a thread from a couple of days ago. My question is the hull will be clear coated so do i really need to use fiberglass matt from the chines to the sheer.
    The material is Honduras Mohogany and is 6mm thick and beneath that is another 4mm of marine ply so there is no doubt of the strength,

    Any thoughts suggestions would be great

    Archie
     
  2. marshmat
    Joined: Apr 2005
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    Location: Ontario

    marshmat Senior Member

    Hi Archie,

    I take it this is the boat? http://www.boatdesign.net/forums/wo...cury-22-footer-coming-along-nicely-23239.html

    Strips laminated over plywood can provide plenty of strength, and the glass skin on such a hull is often more for abrasion resistance and to protect the wood from changes in moisture level that would cause it to swell, shrink and crack.

    Using glass mat for this kind of topsides layup would be unusual. It would be more common, for a protective glass skin, to use a layer of light cloth in epoxy, then do your clear finish coat over that. With the right resin, this is transparent enough that it just looks like a thick varnish coat. If the design is for just a very thin glass skin, it's probably for abrasion resistance- you could skip it, but you'd regret doing so in a few seasons.

    If the glass skin is a structural part of the design, that would be a different matter, but in this case I doubt that it is.
     
  3. Archie1979
    Joined: Oct 2007
    Posts: 57
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    Location: Sydney

    Archie1979 Junior Member

    Thanks for the info Matt, you are right in suggesting that the glass skin is not part of the structural desiign, when you mention light cloth how light do you mean ??

    Thanks for the help
     

  4. DMAN1968
    Joined: Aug 2007
    Posts: 11
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    Location: Baton Rouge, Louisiana

    DMAN1968 Junior Member

    Having used 6 oz. and 4 oz. cloth on the boat i am currently building, 4 oz. wets out clear/transparent...6 oz. and above can be seen without to much difficulty.
     
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