Crack? Or an old patch?

Discussion in 'Fiberglass and Composite Boat Building' started by Jimmy J, Nov 1, 2020.

  1. Jimmy J
    Joined: Nov 2020
    Posts: 11
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    Location: Ontario

    Jimmy J Junior Member

    A dugong? The boat is from Florida some place so maybe it did hit a Manatee haha, not sure of the journey to ontario but luckily for me its here. Im curious to open it up to have a look.

    What is the discoloration caused by?

    Thanks
     
  2. ondarvr
    Joined: Dec 2005
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    Location: Monroe WA

    ondarvr Senior Member

    Discoloration...outside, its the color of resin.

    Inside...dry or poorly wet out glass.

    Structurally the outside is almost irrelevant, do all the work on the inside and leave the outside until later.
     
  3. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    As Ondarvr says, it is a lot easier to assess on-site, but certainly the inside is the place to attack to make it structurally sound, the outside is largely cosmetic, but you don't want cracks that allow water to migrate into the laminate. Hopefully the access to the affected area from the inside is adequate, it is at least somewhat accessible, as your pictures show. If it wasn't, you might baulk at the job.
     
  4. Jimmy J
    Joined: Nov 2020
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    Location: Ontario

    Jimmy J Junior Member

    Ill try cutting into that shoddy patch from the inside to have a look, ill have to wait a few days, once im inside the patch ill post a few pictures and get your guys opinions if its worth even fixing.

    Thanks for the help guys
     
  5. ondarvr
    Joined: Dec 2005
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    Location: Monroe WA

    ondarvr Senior Member

    Grind off the white layer of roving and see if it exposes fractured glass.

    Don't grind through though.
     
  6. Jimmy J
    Joined: Nov 2020
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    Location: Ontario

    Jimmy J Junior Member

    Ill give it a go, I work in a big machine shop so I have excess to any tool ever made.

    Could I use a wire brush on a grinder to shred some of it away?

    cheers,
     
  7. Blueknarr
    Joined: Aug 2017
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    Location: Colorado

    Blueknarr Senior Member

    Could I use a wire brush on a grinder to shred some of it away?

    Wouldn't be my choice. Because I can't control the depth of cut well with wire wheel.

    I would use a 36 grit disk sander
     
  8. Jimmy J
    Joined: Nov 2020
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    Location: Ontario

    Jimmy J Junior Member

    Will give it a go, thank you
     
  9. ondarvr
    Joined: Dec 2005
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    Location: Monroe WA

    ondarvr Senior Member

    A Wire wheel won't do much.

    Grind off the roving and put some water on the surface, it will allow you to see into the laminate.
     

  10. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    That is a good suggestion, wipe it with a wet sponge after sanding.
     
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