Fibreglass mat not 'sticking' to new wood stringer

Discussion in 'Fiberglass and Composite Boat Building' started by greeksteve, Apr 15, 2015.

  1. greeksteve
    Joined: Apr 2015
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    Location: Cambridge

    greeksteve New Member

    Hi - anybody have any ideas as to why F/Glass mat will not attach to new wood inch by inch stringer - keeps rising off top of wood as if air 'blowing' top up. Any suggestions please!!!
     
  2. greeksteve
    Joined: Apr 2015
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    Location: Cambridge

    greeksteve New Member

    OK - have been advised that need to 'round off' stringers as mat will not do 'square' corners - lets have another go then!
     
  3. snowbirder

    snowbirder Previous Member

    ^^^^℅ Correct. Round all surfaces you lay glass on.

    Also, wood does emit some air as it heats. If working outside, apply glass and epoxy at the end of the day, as temperatures drop, not early in the morning, before they rise.
     
  4. linda.vrdoljak
    Joined: Jan 2015
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    Location: Croatia

    linda.vrdoljak Junior Member

    a

    prime wood with resin first ( or deluted resin)

    and second, how heavy is cloth you are using?
     
  5. upchurchmr
    Joined: Feb 2011
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    upchurchmr Senior Member

    Are you literally using mat (chopped strands, randomly oriented) or a woven cloth?

    Also at the base of the stiffener, add filled epoxy to make a fillet, or the glass will not stay stuck down. 1/4" diameter as a minimum. If this is a heavy mat/ cloth that may not be big enough as suggested above.
     

  6. greeksteve
    Joined: Apr 2015
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    Location: Cambridge

    greeksteve New Member

    Thanks for hints guys - also been told to 'round' tops of stringers as mat will not adhere at 90 deg edges + as you say lay fillits (or filler) along base to 'round' base of stringers. Cheers.
     
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