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Thread: Scarf joints separating

  1. #1
    Join Date
    Jan 2017
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    Franklin, KY, USA
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    Default Scarf joints separating

    I've got a problem with my new boat. It has been setting covered on the trailer and it looks like the heat from the sun has caused some of the scarf joints to start separating, 3 on one side (the west facing side) and 1 on the other. Any ideas on how to repair these joints? I used TotalBoat2:1 on 8:1 scarfs on white pine.IMG_2680.jpg

  2. #2
    Join Date
    Oct 2009
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    South Puget Sound/summer Eastern carib./winter
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    Default Re: Scarf joints separating

    joinery is too good
    run a bayonet sawzall blade in there. not by hand, with the sawzall. beat the livin crap out of the scarph and the wood.get thickened with 403 epoxy in there. bring the scarphs back down with screws on fender washers.
    then stop confusing cabinetmaking with epoxy boatbuilding
    ...seen it a hundred god damn times
    sun is not yer scapegoat
    bruce

  3. #3
    Join Date
    May 2006
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    Dog Ranch, USA
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    9,103

    Default Re: Scarf joints separating

    I believe Bruce. That said, I'm curious - what's it like in the joint? Is the epoxy dry and it just let loose because you starved the joint, or is it at all gooey. There's also a chance you got the mix wrong (too).
    Quote Originally Posted by James McMullen View Post
    Yeadon is right, of course.

  4. #4
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    Jan 2017
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    Franklin, KY, USA
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    Default Re: Scarf joints separating

    The joints are dry. I cut them with a hand plane and I had quite a bit of squeeze out.

  5. #5
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    Oct 2009
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    Default Re: Scarf joints separating

    hand plane = smooth flat wood
    when i make an epoxy scarph, i dish it out wirh a disc sander. 36 grit minimum .
    it's a hard thing to get ones head around, that bad joinery is good for epoxy
    the engineering is still important ..(the length and placement of the scarpf)...epoxy is not magic, that's just the way it works
    dishing it out allows one to clamp it so it looks nice , insofar as the ends come together
    squeeze out is over rated ..
    Last edited by wizbang 13; 06-05-2022 at 08:11 PM.

  6. #6
    Join Date
    Apr 2015
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    St. Helens, Oregon
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    4,652

    Default Re: Scarf joints separating

    What Wiz said. All of my joinery tends to be epoxy ready from the get-go. You guys with real skills are missing a bet

  7. #7
    Join Date
    Jun 2010
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    Between Bourgeoisie and Proletariat - Australia
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    Default Re: Scarf joints separating

    Once you've pulled the screws with fender washers, you can either fill with epoxy (which will only do the surface), or i would drill out and epoxy in a plug the thickness of the plank.

    Squeeze out is overrated
    Love it.
    It's all fun and games until Darth Vader comes.

  8. #8
    Join Date
    May 2021
    Location
    Hawaii
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    269

    Default Re: Scarf joints separating

    Quote Originally Posted by Mclark1955 View Post
    I've got a problem with my new boat. It has been setting covered on the trailer and it looks like the heat from the sun has caused some of the scarf joints to start separating, 3 on one side (the west facing side) and 1 on the other. Any ideas on how to repair these joints? I used TotalBoat2:1 on 8:1 scarfs on white pine.
    (pic deleted to save bandwidth)
    Curious. When you epoxied the scarf joints, did you just use unthickened epoxy?

    Or did you use the two step procedure?

    1. Coat both sides with straight epoxy.
    2. Apply thickened epoxy to one side.

  9. #9
    Join Date
    Jan 2017
    Location
    Franklin, KY, USA
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    18

    Default Re: Scarf joints separating

    I was going to use West System Six10 in my repair but no one has any with no known delivery date from West System. So I guess I’m going to use Thixo.

  10. #10
    Join Date
    Oct 2009
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    Default Re: Scarf joints separating

    Is Thixo the Total Boat "ringer" for WEST 610
    I never use the pre made stuff, it locks you into one additive and one consistancy.
    Be sure to employ a lotta "hydraulics of the wrist" .
    Get on it (them)with a 3inch putty knife and pump pump pump the dookie in there . then pump s'more.don't rely on just the pressure of a caulking gun.
    Have to checked to see if every scarph on the boat is hinky? cuz uh....yea
    I like to say that a little bit of epoxy on a boat is not a good thing.Embrace it or reject it.
    Scarphing planks of a carvel boat is kinna daft. Like laminating frames then carvel planking.it's half of a measure .
    i'm assuming your boat is carvel and of course could be wrong.

  11. #11
    Join Date
    Oct 2000
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    Padanaram, MA USA
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    Default Re: Scarf joints separating

    In warmer locations, dark colors and epoxy donít always do well.

  12. #12
    Join Date
    May 2012
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    UK. Cornwall, Suffolk.
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    Default Re: Scarf joints separating

    Quote Originally Posted by wizbang 13 View Post
    Scarphing planks of a carvel boat is kinna daft. Like laminating frames then carvel planking.it's half of a measure .
    Wha dem a say?

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