Infusing, sealing tooling

Discussion in 'Fiberglass and Composite Boat Building' started by nicste, Feb 22, 2014.

  1. nicste
    Joined: Jan 2012
    Posts: 4
    Likes: 0, Points: 1, Legacy Rep: 10
    Location: South Africa

    nicste Nic

    Hi

    I have got tooling that is not 100% airtight, flanges etc.

    I am planning on applying gelcoat to the mould and a layer of 3/4 oz CSM. after that has cured another two layers of 1 oz CSM.

    The big question is how well will this layup seal the tooling when infusing?

    Nic
     
  2. adam_designer
    Joined: Jul 2010
    Posts: 57
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    Location: Banyuwangi, Indonesia

    adam_designer Junior Member

    it seems that you are working on one off mold.
    I was building 100 feet cruiser, the mold was one off,female mold with plywood sheating, coated and smoothed with putty. after gelcoat and first coat (barrier coat - 300 gsm csm x 2 layers) resin infusion was applied. nothing trouble.
     
  3. adam_designer
    Joined: Jul 2010
    Posts: 57
    Likes: 2, Points: 8, Legacy Rep: 37
    Location: Banyuwangi, Indonesia

    adam_designer Junior Member

  4. groper
    Joined: Jun 2011
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    Location: australia

    groper Senior Member

    A couple of layers of glass plus gelcoat should be fine... it all depends on how carefully you do the work tho... it only takes a tiny pinhole to create a leak. You can test the vacuum integrity by putting some breather or flow media material only in the mold and bagging it. Youll up up throwing the bag away after the test however...
     

  5. nicste
    Joined: Jan 2012
    Posts: 4
    Likes: 0, Points: 1, Legacy Rep: 10
    Location: South Africa

    nicste Nic

    okay great, seems like i should be fine.

    i got away with gel, 1x 225 CSM, 1x 300CSM and 1x280 weave on 32ft tooling.

    This is a 76ft vessel so the stakes are a bit higher.

    i feel the best way to go about the layup is to apply gel, and a layer of 225. once that has cured 2x300.
     
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