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H170 Crack Repair

Discussion in 'Day Sailers' started by Marie T. Murphy, Jul 12, 2018. Add this thread to a FAQ

  1. Marie T. Murphy

    Marie T. Murphy

    Joined Jul 26, 2017
    20 posts, 2 likes
    Hunter H376
    Un Kent Is., MD
    Please, What do y'all think of leaving the drilling dust in the crack prep when placing the Plexiguss (sp??) filler so that it acts as a matrix to strengthen the repair? Any other repair suggestions/tips? Many Thanx. Fair Winds..... MRF
     


  2. Crazy Dave Condon

    Crazy Dave Condon

    Joined Jun 8, 2004
    6,442 posts, 506 likes
    -na -NA
    US Anywhere USA
    NO. Make sure you drill a 1/8 inch hole thru the white skin about 3/16 inch thick at each end of the crack to keep it from spreading.
     


  3. Marie T. Murphy

    Marie T. Murphy

    Joined Jul 26, 2017
    20 posts, 2 likes
    Hunter H376
    Un Kent Is., MD
    Dave, Thanx for the timely reply. I've read your other posts.........You're not so crazy, afterall. Fair Winds... MRF
     


  4. Crazy Dave Condon

    Crazy Dave Condon

    Joined Jun 8, 2004
    6,442 posts, 506 likes
    -na -NA
    US Anywhere USA
    If you need further help sen me s private message
     


  5. Marie T. Murphy

    Marie T. Murphy

    Joined Jul 26, 2017
    20 posts, 2 likes
    Hunter H376
    Un Kent Is., MD
    Everyone, esp. CD, PLZ, 1. Do hairline cracks need to be "opened " to use Plexus? 2. What if there's already a separation between edges? 3. Do edges need to be roughened prior to seal? 4. Should I use Acetone to soften edges? 5. How/Why does an hole-prep at end of a crack prevent farther cracking ? Does another sealer work on ACBS, ie: 3M 5200, Loctite, etc. ? Much Thanx, MRF
     


  6. BobbyFunn

    BobbyFunn

    Joined Apr 16, 2017
    264 posts, 124 likes
    Hunter 170
    US Tampa
    This would be the place to start for the acp hull repairs.

    https://hunter.sailboatowners.com/resources/index.php

    Select 146 or 170 or 216 models.
    Some realy good downloads and ideas.


    IMG_20180715_110044.jpg
     


  7. Marie T. Murphy

    Marie T. Murphy

    Joined Jul 26, 2017
    20 posts, 2 likes
    Hunter H376
    Un Kent Is., MD
  8. JimInPB

    JimInPB

    Joined Aug 22, 2017
    866 posts, 240 likes
    Hunter 212 & 170
    us West Palm Beach
    If you have space in the cracks, you should fill the space with some fiberglass, as well as the epoxy. If you don't have enough room for glass cloth, then I would use milled fibers.

    Feathering out the edges prior to adding epoxy will give the epoxy a much wider surface to bond to & make a stronger joint.

    Stop-crack drilling is a process that had been used in aircraft maintenance for many years. The crack concentrates force on a very small point & this keeps the crack moving. Drilling the hole spreads the stress evenly over a larger area & prevents it from spreading.

    I have used 5200 to bond the skin to the foam when it delaminates in small areas, but this practice is not officially sanctioned & some people recommend against it. 5200 is not strong enough to close up a crack in the skin. It may be able to waterproof the crack, but it will not add structural strength. If you are looking to do more than just keep the water out, then you need stronger material. Plexus & Devcon are the two materials that are officially sanctioned. I have also had some luck with West System Epoxy. Details of my motor mount repair on a 170 can be found

    Here -
    https://hunter.sailboatowners.com/mods.php?task=article&mid=11&aid=100114&mn=170
    & Here -
    https://hunter.sailboatowners.com/mods.php?task=article&mid=11&aid=100115&mn=170
     


  9. Marie T. Murphy

    Marie T. Murphy

    Joined Jul 26, 2017
    20 posts, 2 likes
    Hunter H376
    Un Kent Is., MD
    JI, Many Thanx. MRF