Glassing in stringers

Discussion in 'Fiberglass and Composite Boat Building' started by Jeff_40, Aug 18, 2018.

  1. Jeff_40
    Joined: Jul 2018
    Posts: 16
    Likes: 0, Points: 1
    Location: Winnipeg

    Jeff_40 Junior Member

    im curious as to how much cloth I should use on my stringers I have 6oz cloth and 1.50z Matt I have wrapped the stringers in the cloth and plan on laying a half inch thick piece of closed cell weather stripping foam under the stringers with some peanut butter on either side of the foam. Would 2 pieces of 6 oz cloth be ok with that Matt in between them? The boat is a 15 ft Starcraft American the old stuff was wrapped in woven roven
     
  2. Blueknarr
    Joined: Aug 2017
    Posts: 1,233
    Likes: 290, Points: 83
    Location: Colorado

    Blueknarr Senior Member

    No ! Not nearly strong enough by a long shot.

    The roving You are replacing was in the 24oz.

    New math:
    6oz cloth plus 6oz cloth equals 10 oz.

    Use:
    Six or seven layers of 6 oz or
    Two layers of 1708 bi-axial or
    One layer of 24 oz roving

    Only 1/4 inch of foam needed
     
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  3. Jeff_40
    Joined: Jul 2018
    Posts: 16
    Likes: 0, Points: 1
    Location: Winnipeg

    Jeff_40 Junior Member

    Ok thanks for the help I have matting and cloth I was hoping to use up would you recommend doing a layer of matting then cloth then the 1708 if I were to use all 3?
     
  4. Blueknarr
    Joined: Aug 2017
    Posts: 1,233
    Likes: 290, Points: 83
    Location: Colorado

    Blueknarr Senior Member

    From your other posts, I believe you are using epoxy. I was just changing my reclamation to 1700 instead of 1708. RWatson pointed out how mat and epoxy are not a heavenly match. I believe there are limited times when it is appropriate to mix the two, but it isn't good practice most of the time.

    On the wood portion of stringers, 6 oz or mat is a waste of time epoxy ANF glass.

    On the hull roving;
    Did you not easily pull old tabbing off? This is a demonstration of difficulty of bonding to roving.. The heavy texture of roving limits bond zone to just the peaks. New fabric only bonds to 40% of roving surface. To achieve adequate bonding to old roving:
    +use very lightweight cloth to reach into pits (4oz/RWatson or half oz mat /blueknarr)
    +use very large bonding zones (12 inch wide tabbing)
    +grind old roving smooth (weakens hull)
    +Some combination of above.
     
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  5. Glenn Tranchon
    Joined: Jul 2018
    Posts: 12
    Likes: 1, Points: 3
    Location: Wilmington,NC

    Glenn Tranchon Junior Member

    Using anything but 1700 or 1708 is a waste of time and material. Csm is only good for cosmetic repairs or hse inbetween layers of 2 or more 1708 mat together to prevent cracking. Stick with the heavy stuff and youll
    Be fine. Make sure to use a fiberglass roller to get all the air bubbles out.
     
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