Epoxy Resin for Hull Repair

Discussion in 'Fiberglass and Composite Boat Building' started by shamsul hasan, Mar 10, 2013.

  1. Herman
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    Herman Senior Member

    43 degrees C is after cure.

    Before and during cure it does not really matter, in your case.
     
  2. shamsul hasan
    Joined: Feb 2013
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    Location: Pakistan

    shamsul hasan Junior Member

    Thanks for all your help. I need some more help to select the right cloth. Posting a few pictures. First picture is woven roving 24 oz, plan to use it for laminating hull after replacing balsa core. The second pic is carbon fibre 32oz, plan to use it for reinforcing the hull to fix glass-in struts, fortunately this is an area 18inches x 24 inches where the original V struts were bolted from inside,this area does not have any core material and is 3/4 inches thick fiberglass. The third picture is of a 28oz cloth stitched from inside (no mat) and the forth picture is of the same cloth from inside. No specs are availble.
     

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  3. Herman
    Joined: Oct 2004
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    Location: The Netherlands

    Herman Senior Member

    Hmmm, this is difficult. The carbon one, I can only see white fiber? In that case it is not carbon. Carbon is black.

    I can advise you to use the woven roving and perhaps the stitched glass, although it looks a bit beat up to me.

    I am not too fond of carbon mixed with glass, as it is the carbon that will take the full load, not the glass. Also be careful with transitions from a stiff construction to a less stiff construction. The transition should be smooth. Your designer can advise you on how much of which to use.
     
  4. shamsul hasan
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    shamsul hasan Junior Member

    Thanks!! Got it;);)
     
  5. shamsul hasan
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    shamsul hasan Junior Member

    Need help again!! Have taken skin off from the inner hull ( moist area only), it did not come off easily. The balsa is pale brown but moist. Its pretty hot here about 38C and dry. have left the Balsa to dry out. I was reading about CPES injections in the core. Don't have CPES available here. Can I inject epoxy resin in a diluted form???.
     

  6. shamsul hasan
    Joined: Feb 2013
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    Location: Pakistan

    shamsul hasan Junior Member

    Herman,
    Hi!! Was getting my engines rebuilt. That done now, the hull is fully dried up. Will start replacing balsa as required. I did a few samples today with Kukdo Y128 and LGE diluent. Diluted it by adding 10% of diluent and mixed with Ardur 43. The results are: Mix 100:60 (Ardur recommendation) pot life 10-15 mins. Mix 100:50 pot life 20-25 mins.Mix 100:40 pot life 35-40 mins and 100:30 pot life 80 mins.I can live with 40 mins, but to what extent will it effect the structural strength of Epoxy?? The working temperature is 33 Celsius.
    Regards
     
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