Blister in the bag

Discussion in 'Fiberglass and Composite Boat Building' started by rogerball0, Sep 14, 2014.

  1. rogerball0
    Joined: Apr 2010
    Posts: 15
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    Location: uk

    rogerball0 Junior Member

    Have been vacuuming several components and have noticed that where the suction cup attaches to bag and pulls down on the component i'm left with a raised blister.

    [​IMG]

    Above is a picture of a rig attachment point i've bonded in under vacuum and you can see the 'hickey' on the left hand side of the panel.

    Also had a similar problem sheathing composite bulkheads, any ideas why?

    cheers

    roger
     
  2. wet feet
    Joined: Nov 2004
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    Location: East Anglia,England

    wet feet Senior Member

  3. rogerball0
    Joined: Apr 2010
    Posts: 15
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    Location: uk

    rogerball0 Junior Member

    Cheers wet feet, admittedly my suction cups aren't like the ones you describe so will try a home made pressure plate first then if that doesn't work i'll change to the ones you've mentioned.

    Cheers
     
  4. Tungsten
    Joined: Nov 2011
    Posts: 468
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    Location: Canada

    Tungsten Senior Member

    Keep the vacuum off the glass your bagging,lay some extra breather off to the side and bag around it.
    I've read it here before, Keep the frog off the job or something like that.
     
    1 person likes this.

  5. gdavis
    Joined: Dec 2014
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    Location: belfast,maine

    gdavis Junior Member

    The trick with keeping the fitting off the finished laminate is a good one, we use it all the time. We call that extra piece a tail! You can fix that blister by injecting epoxy into it or if it is a bigger one you can grind it out , feather back and scarf in more laminate. Looks like your into it pretty deep, hats off to you!............g
     
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