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Thread: Inboard seam leak

  1. #1
    Join Date
    Jun 2021
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    Default Inboard seam leak

    Hello Everyone.

    I bought a used Arch Davis 11' Sand dollar wooden boat with a centerboard trunk.
    Boat had been out of the water for months.

    I put it into the water and noticed that the seams running along the centerboard and floor of the boat was leaking.
    Actually the seam between the floor and that long piece of wood attached to the floor that runs down the center of the boat. The CB housing is attached to it.

    So should I just seal those seams? What should I use?

    Thanks,

    TC, Hawaii

  2. #2
    Join Date
    Jul 2007
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    Default Re: Inboard seam leak

    Photos would help, but talking in the dark with no real idea of how those seams are joined (based on what little info’ you have provided) but theorising if it’s epoxy glued ply as the Arch Davis website suggests: it may be that the glue lines between the ply and keel/centreboard trunk area have failed and opened up. If that’s the case flip it over, strip off the paint along the joins, do what you can to clean out the glue lines, force in some epoxy and run a decent epoxy fillet along the line. If you want to beef it up a bit run a strip of glass along the fillets and around the keel as well.
    Larks

    “It’s impossible”, said pride.
    “It’s risky”, said experience.
    “It’s pointless”, said reason.
    “Give it a try”, whispered the heart.

    LPBC Beneficiary

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  3. #3
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    Jun 2021
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    Default Re: Inboard seam leak

    Thanks Larks.

    I never thought to flip it over. I was thinking of just caulking the seams inside the boat where the water is coming in.

  4. #4
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    Default Re: Inboard seam leak

    fer gods sake don't put plastic goo in the seams! Before you do anything...Put some water inside the boat...two or three inches...afterwards store in a cool damp place out of the sun.

  5. #5
    Join Date
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    Default Re: Inboard seam leak

    crikey, it needs to leak for 10 hours each time you launch it.
    10 hours minimum
    how are the fake make believe deck seams...they need any touch up ?

  6. #6
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    Default Re: Inboard seam leak

    Quote Originally Posted by pcford View Post
    fer gods sake don't put plastic goo in the seams! Before you do anything...Put some water inside the boat...two or three inches...afterwards store in a cool damp place out of the sun.
    it’s a glued plywood boat Pat. I don’t think it’s going to swell up…
    - Chris

    Life is short. Go boating now!

  7. #7
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    Jun 2021
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    Hawaii
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    Default Re: Inboard seam leak

    pcford,

    I presume you mean sea water. I heard fresh water is bad for wooden boats.
    No cool damp place available here in Hawaii with the boat covered in canvas in a concrete parking lot.

  8. #8
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    Adirondack Mts, New York State
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    Default Re: Inboard seam leak

    Boats leak from the outside in. Any sealant needs to be applied to the outside where the leak actually is. Where you see the water inside the boat may not be the actual leak, it is only where the water has migrated to and appears in the boat. Putting water in the boat may swell it up, but has the added benefit of showing up on the outside where the actual leak is.

  9. #9
    Join Date
    Jun 2021
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    Hawaii
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    Default Re: Inboard seam leak

    Wizbang13,

    I don't follow you about the 10 hours minimum leak.

    Inside seams could use touching up.

  10. #10
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    Default Re: Inboard seam leak

    sorry tc, i wuz fooking with pat.
    plywood boats get epoxy.not soaking

  11. #11
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    Jun 2021
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    Hawaii
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    Default Re: Inboard seam leak

    Chris,

    Will put a bucket full of salt water in the boat tomorrow. It is on a dolly cart so I should be able to see where it is leaking on the bottom.
    It is being kept at the marina in a dirt lot. I keep it covered in canvas.

  12. #12
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    Default Re: Inboard seam leak

    Quote Originally Posted by tcullen123 View Post
    Chris,

    Will put a bucket full of salt water in the boat tomorrow. It is on a dolly cart so I should be able to see where it is leaking on the bottom.
    It is being kept at the marina in a dirt lot. I keep it covered in canvas.
    Good to see where it’s leaking but don’t bother trying to soak it, you’ll just need to dry it out again in order to repair it properly - it’s ply and it won’t “take up” like a timber hull.

    Flip it over, take some photos and post theme here to try and get a picture of what’s actually happening, but I suspect my first post will be on the mark.
    Last edited by Larks; 06-13-2021 at 10:12 PM.
    Larks

    “It’s impossible”, said pride.
    “It’s risky”, said experience.
    “It’s pointless”, said reason.
    “Give it a try”, whispered the heart.

    LPBC Beneficiary

    "Keep away from people who try to belittle your ambitions. Small people always do that, but the really great make you feel that you, too, can become great!"

  13. #13
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    Default Re: Inboard seam leak

    Quote Originally Posted by tcullen123 View Post
    Chris,

    Will put a bucket full of salt water in the boat tomorrow. It is on a dolly cart so I should be able to see where it is leaking on the bottom.
    It is being kept at the marina in a dirt lot. I keep it covered in canvas.
    Canvas is a good cover. Salt water is not needed.

  14. #14
    Join Date
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    victoria, australia. (1 address now)
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    Default Re: Inboard seam leak

    I've been chasing a seam leak in a 12ft ply racing dinghy for 2 years. I reckon I got it this week…….. hopefully…..

  15. #15
    Join Date
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    Default Re: Inboard seam leak

    lotta folks put the log down with dolfinite and not epoxy, cuz they read it in a book.
    the dolfinite dries out, bolts get a few turns ,still leaks.
    the book told them epoxy will crack under a "hit".
    just pray it is not put down with 5200

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