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Thread: Epoxy repairs on clinker and carvel planking

  1. #1
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    Default Epoxy repairs on clinker and carvel planking

    Hi all,

    I was just looking around for articles on clinker repairs and found this document from West System.

    https://www.westsystem.com/wp-conten...and-Repair.pdf

    It espouses epoxy filleting between the planks on old clinker boats to prevent leaking. In another section it talks about gluing splines between adjacent planks on a carvel hull, affixed to both planks, to create what is essentially a monocoque timber hull. It also recommends using splines made of timber that is as hard, or harder, than the existing boat planking.

    So, without wanting to start too much of a debate, it seems like this guidance is intended to encourage the use of lots and lots of epoxy. Surely treating a clinker boat like itís made of plywood (as in the above repair) and completely gluing together a carvel hull is likely to result in catastrophic failure when the timber tries to move with variations in moisture and temperature? Am I missing the point?

  2. #2
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    Default Re: Epoxy repairs on clinker and carvel planking

    Wood boats explode or rot 5 years after being epoxified.
    And gaffers cannot beat off a lee shore.
    everybody knows these things

  3. #3
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    Default Re: Epoxy repairs on clinker and carvel planking



    ...any day now....catastrophic explosion.

  4. #4
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    Default Re: Epoxy repairs on clinker and carvel planking

    Quote Originally Posted by Monzu View Post
    Hi all,

    I was just looking around for articles on clinker repairs and found this document from West System.

    https://www.westsystem.com/wp-conten...and-Repair.pdf

    It espouses epoxy filleting between the planks on old clinker boats to prevent leaking.
    This depends very much on how the boat is used. If dried out so that the epoxy sticks, it will have to be dry sailed aand in mild climates. Other wise soaking/drying cycles making the wood expand and contract will cause the planking to split. If you cannot maintain constant humidity you are far better refastening the laps.
    In another section it talks about gluing splines between adjacent planks on a carvel hull, affixed to both planks, to create what is essentially a monocoque timber hull. It also recommends using splines made of timber that is as hard, or harder, than the existing boat planking.
    Really top class yacht builders often glued splines in over the caulking so that they could finish the topsides bright. But before you take epoxy near any old hull ensure that all of the fastenings are sound, replacing with one size larger if in doubt.
    So, without wanting to start too much of a debate, it seems like this guidance is intended to encourage the use of lots and lots of epoxy. Surely treating a clinker boat like it’s made of plywood (as in the above repair) and completely gluing together a carvel hull is likely to result in catastrophic failure when the timber tries to move with variations in moisture and temperature? Am I missing the point?
    So for clinker, dubious unless you can maintain constant humidity. For carvel, fine, the caulking is intended to lock the planks together, so glued splines will do that job permanently.
    It really is quite difficult to build an ugly wooden boat.

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  5. #5
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    Default Re: Epoxy repairs on clinker and carvel planking

    Quote Originally Posted by wizbang 13 View Post


    ...any day now....catastrophic explosion.
    You have those images in the wrong order. Just sayin
    It really is quite difficult to build an ugly wooden boat.

    The power of the web: Anyone can post anything on the web
    The weakness of the web: Anyone can post anything on the web.

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