Stress cracks or gel coat damage? see attachment

Discussion in 'Boat Design' started by 75HUSTLER, Jun 23, 2006.

  1. 75HUSTLER
    Joined: Jun 2006
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    Location: SOUTHERN CAL

    75HUSTLER Junior Member

    Is this considered a stress crack or just gel coat damage? Can anyone advise me on how i would go about repairing this kind of damage or a way to keep it from getting worse. I want to re-paint the boat also so if that makes it any easier than let me know. see attachment. click paperclip. if it doesnt work ignore this post for now. thanks anyways.

    Attached Files:

  2. bntii
    Joined: Jun 2006
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    Location: MD

    bntii Senior Member

    I assume its at the starboard corner of a transon?

    I'd say stress crack for sure. Tough to say if these cracks are limited to just the gel coat, or if they involve the laminate under. For certain, they reflect the parts flexing to a greater degree than the material can take without cracking. If the gel coat is thick in this corner as is often the case, the gel coat is more prone to cracking. Just grinding out the surface and laying up light cloth may do the trick. If the underside is accessible, laying up heavy glass to a well ground surface is the surest path to a repair which will not re-crack. In this case taper layup onto flat panels out from corner & shoot for ~1/4" of glass on corner. Grind out face by cutting into layup about 1/8" in corner and along path of cracks. Cut tapers onto surface out ~2". Layup glass and fill the 'valley' you cut. Lay down some mat first and use an epoxy such as West Systems or Mas. A bit of cabosil in the epoxy helps to get a good bond to surface. Sand and fair with 3m poly filler and prime before paint.

  3. SeaSpark
    Joined: Mar 2006
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    Location: Holland

    SeaSpark -


    These must be stress cracks, sharp corners in a design concentrate the stress so this is a logical place. You can also see hairline cracks radiating from the main crack, a sure sign of stress a crack. As Bntii said, laying up heavy glass on the underside is the best solution.
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