CSM Layup question

Discussion in 'Fiberglass and Composite Boat Building' started by crossram, Oct 24, 2013.

  1. crossram
    Joined: May 2013
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    crossram Junior Member

    I am building some parts and my stack up is

    1.5 CSM
    1.5 CSM
    Knytex X-Mat 19.3 oz/sq yd

    laying up the two layers of CSM I wetted they up separately.

    On the next go around to save time and resin is it OK to lay them up at the same time?
     
  2. Landlubber
    Joined: Jun 2007
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    Location: Brisbane

    Landlubber Senior Member

    Just try putting the second sheet over the wet sheet and start rolling it out, most likely the sheet will wet out just from the amount of resin in the first sheet, experience will sort it out for you mate, most people over wet the first layers anyhow, so do not worry, you can of course always add more resin to the second sheet where it is dry.
    Use a roller to apply the resin and a metal roller to pack it down (called consolitating). Sometimes a squeege is used to spread resin onto cloth, horses for courses.
     
  3. Landlubber
    Joined: Jun 2007
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    Location: Brisbane

    Landlubber Senior Member

    You are aware that there is and up and a down side to the csm?, Have a close look, one side has the binder and the hairs do not stand up so much on that side.
     
  4. crossram
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    crossram Junior Member

    I didn't know that thanks!
     
  5. redreuben
    Joined: Jan 2009
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    Location: Beaconsfield Western Australia

    redreuben redreuben

    I would lay up one csm as a skin first, then check for bubbles scuff, and lay up the other csm and Xmat together.
    Depends on the job of course but I would consider using 3/4 oz split strand as the skin layer and then a 1.5 or 2 oz csm together with the xmat.
    The split strand is better at masking print through in the finish.
     
  6. crossram
    Joined: May 2013
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    crossram Junior Member

    No gelcoat as more connection work will be done later. Might give it a coat of duratec at the end prior to paint. It's for a race car and the gelcoat seems to ad a lot weight.
     
  7. PAR
    Joined: Nov 2003
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    PAR Yacht Designer/Builder

    Mat/Knytex/mat should be the laminate orientation. Yep, gelcoat is heavy, then again using mat is also heavy.
     
  8. redreuben
    Joined: Jan 2009
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    Location: Beaconsfield Western Australia

    redreuben redreuben

    If it's for a race car I would look at a vinyl ester kevlar lay up.
     

  9. waikikin
    Joined: Jan 2006
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    Location: Australia

    waikikin Senior Member

    If you're chasing weight & post finishing the surface maybe you can drop one chop but double or triple some cut & torn strips maybe 3-4" just for around the trimmed edges.
    Jeff.
     
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