Laminating - rough surface biaxial

Discussion in 'Fiberglass and Composite Boat Building' started by andysailor, Sep 12, 2017.

  1. andysailor
    Joined: May 2017
    Posts: 14
    Likes: 0, Points: 1
    Location: Sweden

    andysailor Junior Member

    It's a sugar scoop on a sailboat and my plan was to use (on each side of the foam):
    1 layer Biaxial 450g
    1 layer woven 450 g
    1 layer csm 180/360g

    Building a sandwich construction with foam and fiberglass.
    40% got pretty rough on the first layer, do I need to sand this down, or would it be possible to fill it with a filler, before adding a new layer of fiberglass?

    Sanding if a pain and when it's a radius it doesn't make it easier to sand.
     
  2. Mr Efficiency
    Joined: Oct 2010
    Posts: 6,206
    Likes: 127, Points: 63, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    You should have laminated it on one side, completed, in one go, by the sound of it.
     
  3. andysailor
    Joined: May 2017
    Posts: 14
    Likes: 0, Points: 1
    Location: Sweden

    andysailor Junior Member

    That would have been the best, but that's to late :)
    Is sanding it smooth my only option?
     
  4. Mr Efficiency
    Joined: Oct 2010
    Posts: 6,206
    Likes: 127, Points: 63, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    Some light sanding to provide a key for your next layer, followed by a layer of light mat, then your woven, finish with light mat. If I am understanding you right, you have just the biax done ? I think you need that resin rich mat against what you have already done , to bond the new to the old.
     
  5. andysailor
    Joined: May 2017
    Posts: 14
    Likes: 0, Points: 1
    Location: Sweden

    andysailor Junior Member

    Yes, I have only done one biax so far. I'm just afraid of air bubbles cause of roughness .
     

  6. fallguy
    Joined: Dec 2016
    Posts: 263
    Likes: 9, Points: 18, Legacy Rep: 10
    Location: usa

    fallguy Senior Member

    I'm going on a limb you didn't use laminating roller. Air is redo, imo.
     
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