Cracked Keel 1999 starcraft 2290

Discussion in 'Boatbuilding' started by Ra3ei Ba7er, Sep 22, 2011.

  1. tunnels

    tunnels Previous Member

    Did you add a couple of extra layers of glass to the inside vertical side of that foam ?? That would give you a stringer effect !! to help even more support the bottom !
    Relaunching day will be soon ??
    Like to hear how the boat goes !:D
     
  2. Ra3ei Ba7er
    Joined: Sep 2011
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    Location: Saudi Arabia

    Ra3ei Ba7er Junior Member

    Yes I did, What you see in the pictures is 4 layers total
    I think Relaunching date will be possible within 2 weeks maximum
     
  3. Ra3ei Ba7er
    Joined: Sep 2011
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    Ra3ei Ba7er Junior Member

    Today we fixed the tunel under fuel tank and glassed it
    see pictures
     

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  4. tunnels

    tunnels Previous Member

    Is best never to glass over any gelcoated surface !! Should always grind all gel coat off back to Bare glass so you are onto the glass fibres !!All ways use course dics with rough sand paper best also to roll a coat of just catalysed resin over the surface when its finished to totally seal and keep the water out if the glass . Osmosis can and does form inside of boats sometimes . No one ever takes any notice !! :confused:

    We have a mould here that had water between the product and the mould , possible for long time so now the mould has lumps!! osmosis !:eek:
     

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  5. Ra3ei Ba7er
    Joined: Sep 2011
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    Ra3ei Ba7er Junior Member

    I got it, Thanks a lot for your valuable information, I forgot to tell you that I am a Geologist, and I also have a family business (sandblasting and coating), we do surface preparation ( Chemical or Mechanical ) for substrates before any kind of coating.
    For paint to strongly adhere to the substrate, the surface profile after blasting is very important for several reasons mainly:
    1- Remove rust, debris, corrosion...etc from the substrate
    2- Make the paint adhere strongly to the substrate.
    In my boat we grinded to bare fiber glass layer, in some areas the gelcoat was hard as steel, despite using hard sand disc which we usually use with steel, wherever we glassed substrate "the hull" was grinded very well for the glass to adhere and bond strongly.
    Rest assured I followed and will keep following your valuable expertise instructions.
     
  6. Ra3ei Ba7er
    Joined: Sep 2011
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    Ra3ei Ba7er Junior Member

    today we did oonly what you see in the picture
     

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  7. Ra3ei Ba7er
    Joined: Sep 2011
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    Ra3ei Ba7er Junior Member

    Hi again
    Today we did the 2 partitions holding the fuel tank from front and back, but unfortunately we found that it is 10cm far from the correct place witch mean the boat floor might not set properly, we will redo it later.
    To repair the crack from outside I removed the hull from the trailer and now it is sitting on tires on the ground
    Tomorrow i will post pictures
     
    Last edited: Nov 12, 2011
  8. tunnels

    tunnels Previous Member

    Ok will watch to see pictures ! :D
     
  9. Ra3ei Ba7er
    Joined: Sep 2011
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    Ra3ei Ba7er Junior Member

    These are the pictures of today, we could not continue, hopefully tomorrow we will.
    You cannot see the crack on this side, The last 2 pictures are for the cracked strake, off course we will do both strakes.
    We started grinding to bare fiber 2 inches along the strake, please let me know what should I do.
    If enlarge the third picture from top, you will see the previous repair done by us, the fiber color is different, more will be visible when we grind further.
     

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    Last edited: Nov 13, 2011
  10. Ra3ei Ba7er
    Joined: Sep 2011
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    Ra3ei Ba7er Junior Member

    Ok
    Today we finished 0ne strake grinding, laminating with 2 layers 450 CSM then one coat white gelcoat
    Tomorrow we will do the other strake, then my auto painter will do his job to smooth finishing and color match
    see todays pictures
     

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  11. tunnels

    tunnels Previous Member

    Good job !! All takes time and effort
    No leaks and no cracks and strong like it should have been in the begining
    ! All takes time . If this had been done in the begining you would not have to redo it now
    When you build a boat some time in the future remember what you had to do because someone did not have the fore sight to fill the strakes and make the bottom strong and more ridged . This is a fauling in every boat company ,every counrty, every where !!. i hope if anyone else has been following this that they will think about the problem and do something about it in there place of work . Small power boat up to 30foot plus . we fill all the strakes becasue if the boat hits a submerged object and the strake gets damaged the water can not get into the rest of the laminate . because the strake is glassed to be a completely separate part . solid bottoms are less at risk but cored bottoms you could have a major problem as the water would get totally into the laminante and the core simply because the strake has never been glassed over totally but as a separte itam . :cool:
     
  12. tunnels

    tunnels Previous Member

    Its what we do !!

    This is what is happeing inside our 42 footer right now . The foam is H80 and gets extra glass under the foam is set in a mixture of aerosil, micro fibres,talc, resin, will be ground level with a big grinder just to make sure its flat then glassed with Quad 1225 gram , then the rest of the internal glassing carries on .
    It was a csm , light quad lay up but have changed a little with a heavyer quad using less csm and saving a little on resin in the process .
    Are getting all the hull and deck layups re-engineered and spec-ed as they are all old and out of date and a mile to heavy !!
     

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  13. Ra3ei Ba7er
    Joined: Sep 2011
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    Ra3ei Ba7er Junior Member

    Great work and specs
    I wish that my boat strake was bigger to fill it with Divinicel and then do the glass laminate. however we did what we could
    Still alot of work ahead
     
  14. tunnels

    tunnels Previous Member

    YES NON OF OF WHAT YOU HAVE DONE WOULD HAVE BEEN NESSASARY IF IT HAD BEEN DONE WHEN THE BOAT WAS FIRST BUILT .
    I just hope oneday a boat builder will look at this and say thats a good idea !!
    The guys hav glass it all today and its ready to have the next layers of glass to carry on building the hull . and eventually finish end of the week or early next week .
     

  15. Ra3ei Ba7er
    Joined: Sep 2011
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    Location: Saudi Arabia

    Ra3ei Ba7er Junior Member

    Today we finished the other strack, found alot of air puckets in old fiber, please inlarge pictures to see clearly and let me know what you think

    Tomorrow we will start painting for the 1st stracke it should be fully dry now.
     

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