Black area in fibreglass

Discussion in 'Fiberglass and Composite Boat Building' started by bmwtechie, Jun 7, 2010.

  1. bmwtechie
    Joined: Jun 2010
    Posts: 1
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    Location: new zealand

    bmwtechie New Member

    I am currently stripping my fibreglass Hull for repair, the floor had rotted away, so decided to strip it right down to the bare hull, every hollow area of the Hull is filled with Foam, which holds alot of water, I have had the boat under cover for 1 year, and the foam is still full of water, there is one corner near the transom where the fibreglass is Black and seems soft?

    Firstly what is this that i am seeing? is it the wood of the transom rotting through the fibreglass?

    I am planning to strengthen the transom with 18mm more thickness by glassing in another layer of Ply, is this a good idea?

    Any help on this black area would be appreciated

    Thanks
     
  2. hoytedow
    Joined: Sep 2009
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    hoytedow Carbon Based Life Form

    It sounds like black mold and rotting wood to me. That will have to be cut out and replaced/reglassed. I don't envy you. There are threads addressing those methods here. Do a search under "mold" or "rot".
     
  3. hoytedow
    Joined: Sep 2009
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    hoytedow Carbon Based Life Form

  4. tunnels

    tunnels Previous Member

    Are you going to cover the old with yet more wood and glass ??

    When you say another layer of ply wood do you mean over whats there ? :confused:
    If you are intending to cover the old you are a nut case :mad: . what do you think will happen , the rot wont stop it could even get worse and rot quicker . it feeds its self and sealed it has its own coccoon for the spoors to breed in .
    Plus the weight of the wet plywood and then another layer and yet more wet plywood :( :p
     
  5. tunnels

    tunnels Previous Member

    The black area you need to dig into it and find what it is !! dont be afraid just do it !!!:p
     
  6. Herman
    Joined: Oct 2004
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    Location: The Netherlands

    Herman Senior Member

    In the Netherlands we have a saying: gentle doctors make smelly wounds.

    You get the picture: Out comes the angle grinder! Grind away whatever you do not like, and rebuild to your (or our) standards.
     
  7. tunnels

    tunnels Previous Member

    theres possibly damp under the glass and coming up through the glass where there are tiny hold through to the core under the glass layer . it'll be wet for sure so use a good course disc on the grinder and have fun !!:D
     
  8. TeddyDiver
    Joined: Dec 2007
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    Location: Finland/Norway

    TeddyDiver Gollywobbler

    Might also be a "burn" in the lamination process- too much hardener, too thick layer.. What ever, grind it away..
     
  9. Typhoon
    Joined: Mar 2009
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    Location: Australia

    Typhoon Senior Member

    I like that saying, I might start using it!

    As for bmwtechie's boat, I've seen production boats laid up with a dry laminate and mould gets in and grows in the fibres on the surface. If you are lucky, that's what it is.

    Regards, Andrew.
     
  10. Herman
    Joined: Oct 2004
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    Location: The Netherlands

    Herman Senior Member

    Yep, the Dutch are not so bad... (well except for Joran van der Sloot, I guess)

    So as for a quick repair: get the grinder running!
     

  11. tinhorn
    Joined: Jan 2008
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    Location: Massachusetts South Shore.

    tinhorn Senior Member

    Hahahahahahaha! Indeed.
     
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