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Thread: Plywood repair

  1. #1
    Join Date
    Jan 2013
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    Lakebay, WA
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    Default Plywood repair

    My GlenL 15 has lots of cracks in the paint, that go into the plywood.
    What to do to get rid of them?
    ..... is there a way to remove nails without to much damage to the plywood ?
    20180730_153116.jpg
    Last edited by 2dogsnight; 08-01-2018 at 09:52 AM.
    1955 Fontana 18' - 1958 Atomic 4
    1960 Skippy 12C FeatherCraft - 1947 Mercury KD4 Rocket
    1985 Glen L15 - 1980 Johnson 7.5 hp
    2016 kayak Mill Creek 13

  2. #2
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    Dec 2003
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    Sound Beach, NY
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    Default Re: Plywood repair

    It just looks checked to me, not uncommon in plywood. I built a Glen-L Topper in the eighties of fir ply. It checked inside where painted, not outside where I rolled polyester resin. I would use filler on those checks. Sanding it clean, fill with thickened epoxy and coat with epoxy will likely solve the problem. Those nails may be ring nails (mine were) they won't come out.

  3. #3
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    Default Re: Plywood repair

    Thank you John!
    1955 Fontana 18' - 1958 Atomic 4
    1960 Skippy 12C FeatherCraft - 1947 Mercury KD4 Rocket
    1985 Glen L15 - 1980 Johnson 7.5 hp
    2016 kayak Mill Creek 13

  4. #4
    Join Date
    Jun 2007
    Posts
    616

    Default Re: Plywood repair

    If they are ring shank nails and have to come out, get a very small one of these. I don't know if they are made smaller than 1/4". You will need to remove the head of the nail to minimize the hole made by the extractor.

    http://www.rockler.com/screw-extractor

  5. #5
    Join Date
    Jul 2011
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    Lindstrom, MN
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    Default Re: Plywood repair

    There are actually three things that you can count on. Death, taxes and checks in fir plywood. I had the same problem. I just cleaned up the surface and covered the checks with glass and epoxy. It has been 6 years with no further checking.

    While I would never recommend CPES (because railing against it irritates the true believers) this is the best application for the stuff. OK, in this case maybe, but only in addition to John's recommendation. I would be surprised if John's recommendation lasts more than a year or two without adding a light layer of glass cloth to keep the checks in check. Even 2oz cloth does work. Kraft paper should work, but that experiment might prove more interesting than effective, so until I try it, I can't say it will work.

    Maybe a nail kicker? Not really for this problem because the wood around the nail looks good, but others might find the tool useful. I found that here: https://sawmillcreek.org/archive/ind.../t-124133.html Someone in that post also suggested a quarter shrinker, but in the unlikely event that it can extract a nail, the speed and direction are anybodies guess.
    Last edited by MN Dave; 08-01-2018 at 11:46 AM.
    Management is the art of counting beans. Leadership is the art of making every being count. --Joe Finch

  6. #6
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    Dec 2003
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    Sound Beach, NY
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    Default Re: Plywood repair

    I'm not sure that epoxy alone will cure checks that have already started. The dinghy I built with polyester (!) resin on it still looks good after 30 years.
    A replacement seat on WS is checked ply. I keep thinking I'll fill it, but I just paint it instead.

  7. #7
    Join Date
    Nov 2004
    Location
    Port Townsend WA
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    11,513

    Default Re: Plywood repair

    Trust me, mahogany plywood will check as well! The only way to avoid the problem is to glass it. Then you end up with a heavy boat and the seven year itch!
    This is one reason I prefer to build boats of traditional materials.
    Jay

  8. #8
    Join Date
    Jan 2013
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    Lakebay, WA
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    Default Re: Plywood repair

    I just wanted to make this boat look better - have some nice finish here and there.
    From what Dave, Dusty and John suggested - I think I would go with 1/4" screw extractor to just remove some plywood around the nail, pound it in deeper and install a bung.....then glass it, varnish it.

    glen1.jpg

    ….....but Jay got me thinking of taking the plywood deck off and replacing it with cedar strips. That would be a lot of work, but the result could be fantastic!
    Perfect project for long retirement years

    For now I will be using the boat in it's current stage.......
    Thank you for sharing your experience !!

    glen.jpg
    1955 Fontana 18' - 1958 Atomic 4
    1960 Skippy 12C FeatherCraft - 1947 Mercury KD4 Rocket
    1985 Glen L15 - 1980 Johnson 7.5 hp
    2016 kayak Mill Creek 13

  9. #9
    Join Date
    Jan 2013
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    Lakebay, WA
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    677

    Default Re: Plywood repair

    took my Glen L for 4 hours on the water and we think that this may be our main boat. Designer recommends 7.5HP motor max. I have Johnson 7.5 on it and was pushing the boat fine. Have also 18HP Evinrude.....but short shaft. It will require cutting the transom. Not sure about that.....

    1955 Fontana 18' - 1958 Atomic 4
    1960 Skippy 12C FeatherCraft - 1947 Mercury KD4 Rocket
    1985 Glen L15 - 1980 Johnson 7.5 hp
    2016 kayak Mill Creek 13

  10. #10
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    Default Re: Plywood repair

    Looks great!

  11. #11
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    Default Re: Plywood repair

    maybe a little too much bright finishes for me on this Glen L14, but rally like the seat and control console.
    Would like to make something similar, would go with removable side outboard controls......would still like to use as a sailboat sometime in the future.
    Glen L14 power3.jpg
    1955 Fontana 18' - 1958 Atomic 4
    1960 Skippy 12C FeatherCraft - 1947 Mercury KD4 Rocket
    1985 Glen L15 - 1980 Johnson 7.5 hp
    2016 kayak Mill Creek 13

  12. #12
    Join Date
    Jan 2008
    Location
    Lake Champlain, Vermont
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    2,599

    Default Re: Plywood repair

    glass the checked plywood with dynel or 6 oz. glass. Then paint.

  13. #13
    Join Date
    Jan 2013
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    Lakebay, WA
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    Default Re: Plywood repair

    Quote Originally Posted by Oldad View Post
    glass the checked plywood with dynel or 6 oz. glass. Then paint.
    that's the plan for sometime in the depths of coming winter
    1955 Fontana 18' - 1958 Atomic 4
    1960 Skippy 12C FeatherCraft - 1947 Mercury KD4 Rocket
    1985 Glen L15 - 1980 Johnson 7.5 hp
    2016 kayak Mill Creek 13

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