Correct method to join fibreglass panels

Discussion in 'Fiberglass and Composite Boat Building' started by tropicrows, Apr 7, 2008.

  1. tropicrows
    Joined: Feb 2005
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    tropicrows Junior Member

    I have two section of fibreglass which a need to butt up against each other and join. I was going to use polyester resin with 4 layers 450gm CSM on the un-seen side. Then I was going to grind out the front joint line to about 20 mm wide x 1 mm deep and fill this with epoxy filler.
    Is this suitable method or should I be adding some reinforcement to the front side as well before filling, or should I be doing the whole job differently. The last thing I want is a cosmetic crack appearing at a later date. All advise appreciated.
     
  2. Herman
    Joined: Oct 2004
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    Herman Senior Member

    If you do not want the crack to appear, beef up the rear side as you suggest, then grind out the front, tapered 1:8 or even 1:12 and replace the lost glass nicely. Sand smooth, re-gelcoat or paint.
     
  3. rwatson
    Joined: Aug 2007
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    rwatson Senior Member

    Bit of a knowledge gap here.

    What kind of pressures are going to be applied to the panels - are we talking structual hull, inner shell, deck, cuboard doors ,8x4, 6inches by 18inches

    Thickened epoxy might be enough for some applications.
     
  4. Landlubber
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    Landlubber Senior Member

    Whatever the use, herman has it about right anyhow.
     
  5. Herman
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    Herman Senior Member

    Failing to taper the repair, which it is basicly, will always make the crack re-appear.
     
  6. rwatson
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    rwatson Senior Member

    It wouldnt be enough for exterior hull with high loadings - you would need inner and outer laminations, and not just of chopped mat either.
     

  7. tropicrows
    Joined: Feb 2005
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    tropicrows Junior Member

    Thanks Herman,
    the joint in on the inner shell in the deck area. I will go with the 1:8 tapper fill with glass and then finish with epoxy filler.
     
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