Kevlar to cover blister peel?

Discussion in 'Materials' started by breath2000, Jan 20, 2014.

  1. breath2000
    Joined: May 2007
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    Location: Florida

    breath2000 New Member

    With serious blistering, I did a double peel on the bottom of an 1989 Endeavour 38 and I want to put a layer of 5 oz.kevlar with epoxy to replace the fiberglass so that I won't have to put two layers of fiberglass cloth. Is there any reason why this might not be a good idea?
  2. gonzo
    Joined: Aug 2002
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    gonzo Senior Member

    Kevlar i s much harder to wet and lay flat than fiberglass. The labor and expense will be more. Also, the thickness of the laminate, regardless of material, has a lot of bearing on stiffness. Whatever material you use, the laminate has to end up at the same thickness.
  3. PAR
    Joined: Nov 2003
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    PAR Yacht Designer/Builder

    Kevlar fabric prices are usually 8 to 10 times the cost, for the same weight of conventional 'glass cloth, so this will be a mitigating factor. It also isn't nearly as easy to apply as 'glass cloth, so I hope you have some serious laminating skills.

    A 5 ounce layer of Kevlar will be about the same as a couple of layers of 6 ounce biax or a single layer of 12 ounce biax. If it was me, I'd use a knitted fabric "combo" fabric (1208), so it's easier to fair the hull. 1208 is $8 to $10 bucks a yard.
  4. redreuben
    Joined: Jan 2009
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    redreuben redreuben

    Kevlar is hydroscopic and will take up water if exposed, further, when abraded it fluffs up like steel wool ! Pain in the arse to repair. To get it fair again you have to wet sand it, oops.
  5. Baltic Bandit

    Baltic Bandit Previous Member

    Kevlar is also a PITA to "wet out" so its much more likely you will have microvoids that will slurp water into the weave making an even worse blister problem.

    Seriously bad idea for the final layer of the hull.

  6. PAR
    Joined: Nov 2003
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    Location: Eustis, FL

    PAR Yacht Designer/Builder

    If properly applied it can work well, but application difficulties and cost are the main concerns. We have to assume it will be fully wetted out and applied with established protocols and if so, a costly and troublesome to apply skin, but certainly doable.

    Where in Florida are you? I'm near Orlando.
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