Strange epoxy wetout

Discussion in 'Fiberglass and Composite Boat Building' started by rwatson, Oct 16, 2007.

  1. rwatson
    Joined: Aug 2007
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    Location: Tasmania,Australia

    rwatson Senior Member

    Thats some good thoughts Pepper. Whats "kicking" mean though?
     
  2. the1much
    Joined: Jul 2007
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    Location: maine

    the1much hippie dreams

    hardening,( gel'in)
     
  3. Pepper
    Joined: Oct 2007
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    Location: California

    Pepper New Member

    We call "Kicking" the start of an exothermic reaction. The resin starts to create its own heat... which then creates more heat... this is why you want to use a cookie sheet instead of a cup to hold your mixed batch. If you have a puddle of resin in your mold...it can "exotherm" and burn... or pull away from the mold. That it why I use paper towels to soak up the extra resin.
     
  4. Roly
    Joined: Jul 2005
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    Location: NZ

    Roly Senior Member

    My best results over timber for a clear finish have been using double washed silane surfboard glass (6oz) and heating the work where possible as warm resin goes viscous real fast on cold work face.
    Also preheat work well before, switch off, and glass on cooling phase to reduce
    air bubbles. (outgassing)
    I have experienced the silver flecks,damned annoying.
    What also pi##es me off is the tendency for one to want to "overwork" the resin introducing air (milkiness).
    For the best finish, I calculate out the amount of resin,spread with the least fuss,apply the pre-cut glass and let sit for 5mins. Lightlly squeegee out excess to edge.
    The less working (rolling,squeegee-ing) the clearer the finish. There is a knack to it.
     

  5. rwatson
    Joined: Aug 2007
    Posts: 5,868
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    Location: Tasmania,Australia

    rwatson Senior Member

    Thanks for the valuable advice Roly and Pepper. The comments make a lot of sense, and if I am ever silly enough to do another boat (next year), this will be a big help.
     
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