air pockets when laying-up large sections of thick CSM into intricate moulds

Discussion in 'Fiberglass and Composite Boat Building' started by Fishbonemarine, Jun 9, 2018.

  1. Fishbonemarine
    Joined: Jun 2018
    Posts: 1
    Likes: 0, Points: 1
    Location: philippines

    Fishbonemarine New Member

    when i wet layup into an intricate multi angled/shaped mould, i find after the surface vale and 2 layers of x 225 CSM - when i start using 450 csm i keep getting air pockets and cant get them out -- just end up chasing my tail with the rollers and the 450 lift's again , and back to air pockets ,, iv tried extra styrene in the resin to wet the thick cloth , but im not winning,,
    is it better to lay smaller sections of thick cloth and over lap ??
    as i'm just having to much trouble laying big sections of 450 into multi angled /shaped moulds
     
  2. SamSam
    Joined: Feb 2005
    Posts: 3,736
    Likes: 133, Points: 63, Legacy Rep: 971
    Location: Coastal Georgia

    SamSam Senior Member

    Can you just use two layers of 225? I would think you might be able to wet out two layers of that and then use the bubble buster roller on them both at the same time.
     
  3. ondarvr
    Joined: Dec 2005
    Posts: 1,749
    Likes: 82, Points: 48, Legacy Rep: 506
    Location: Monroe WA

    ondarvr Senior Member

    Depending on the exact CSM, the exact resin, the shape of the part, plus a few other things, this can happen fairly often. The lighter weight CSM can make it much easier to roll the air out.
     

  4. redreuben
    Joined: Jan 2009
    Posts: 1,575
    Likes: 47, Points: 48, Legacy Rep: 349
    Location: Beaconsfield Western Australia

    redreuben redreuben

    Make a thick paste with your catalysed resin, talc is cheap but heavy or a micro balloon or silica type filler and paint that around your problem areas you could even add some chopped up csm if you need the strength, glass over wet on wet. Don’t over roll or you’ll push the filler out.
     
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