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Thread: Glue question

  1. #1
    Join Date
    Feb 2012
    St. Catharines, Ontario, Canada

    Glue question

    I use yellow carpenter's glue for most of my glue ups, and have, really, no joint failures. However, I am gluing blocks to the inwales of my canoe, and this will require some gap-filling, no matter now carefully I match the block to the inwale. So, I am thinking about Gorilla Glue, or similar. When this expands, will it have the strength to hold the seats up? The strain will be a shear strain, as the force on the joint will be straight downwards, and any gaps will probably be on the order of 1/32" or less. I intend to reinforce it with a pair of #14, 2" screws as well, but I don't want the seat suddenly plunging to the bottom of the canoe when I am half a km out on Lake Ontario. Will the Gorilla Glue do the job, or something else, or something else altogether?


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  2. #2
    Join Date
    Jul 2011
    The Gorge Area, Oregon
    Quote Originally Posted by Roger Tulk View Post
    So, I am thinking about Gorilla Glue, or similar. When this expands, will it have the strength to hold the seats up?

    Personal recommendation would be to glue in some really thin shims to fill the gap or (better) to use sandpaper to "lap" the pieces together (basically stick sandpaper to the boat side and then lap the block to that) before gluing to get a gap free joint.

    Failing that mix some wood dust into epoxy and use that - it won't be as strong as a wood-wood bond but is probably the next best thing.

  3. #3
    Join Date
    Dec 2006
    RETIRED(!) in Austintown, Ohio
    I concur with what Ryan said.

    Gorilla glue would fail the first time you sat on the seat.
    Jim D.

  4. #4
    Join Date
    Nov 2012
    Wapakoneta, OH
    I'll pile on, Gorilla Glue is not gap filling. I like both of the ideas that Ryan offered, the thin shims one best.

  5. #5
    Join Date
    Dec 2006
    Yorktown, Virginia
    When I helped my dad build several boats many years ago, we would not use anything except resourcinol glue, but it did not have good gap filling qualities.

  6. #6
    Join Date
    Nov 2006
    Austin, Texas
    The foam of Gorilla Glue has almost no strength, so once it becomes gap filling, it is little more than calk (and I would choose other things for calk).

    I haven't done tests on the strength of epoxy, but it does great as a gap filler, especially when mixed with some sawdust or other bulk.
    Charlie Plesums, Austin Texas
    (Retired early to become a custom furnituremaker)
    Lots of my free advice at

  7. #7
    I just hung the seat on my canoe from the inwales with 3/16" carriage bolts run through dowels. No extra blocks to glue up or fail.

  8. #8
    Join Date
    Oct 2006
    The Heart of Dixie
    There are gaps and then there are gaps. But you only have two options that I see. Better fit or use epoxy. Epoxy is the only glue that I am aware of that has gap filling ability.
    God grant me the senility to forget the people I never liked anyway,
    the good fortune to run into the ones I do,
    and the eyesight to tell the difference.

    Kudzu Craft Lightweight Skin on frame Kayaks.
    Custom built boats and Kits

  9. #9
    Join Date
    Feb 2008
    S E Washington State
    On the little sail boat I have been working on for 9 years and have yet to finish, I used "fumed silica" mixed in the epoxy where I needed gap filling. Works great.
    "We the People ......"

  10. #10
    Join Date
    Feb 2008
    East Freeetown, Massachusetts

    I also say NO - to using ANY adhesive to hold the seat in place - there is NO adhesive I will recommend.

    The seat needs to be supported is "some" fashion - preferably from "under" the seat.

    In the following myriad of images the vast majority of seat are in some way supported - most from under the seat.

    In fact - you do not need any adhesive at all and you don't need to worry about gaps.

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