(dubious) sizing on glass cloth

Discussion in 'Materials' started by Anatol, Apr 22, 2017.

  1. Anatol
    Joined: Feb 2015
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    Location: los angeles

    Anatol Senior Member

    Hi all,
    I'm working on a low budget epoxy/glass over ply project. I've bought some glass bandage from possibly dubious sources. I've had some difficulty with wet out. One 4" product seemed ironed flat and the edges (about 1cm, either side) refused to wet out. Another (8") has patches that resist wetting out. I suspect bad/contaminated sizing. (Yes, I've encapsulated ply before applying glass).

    Can I cook or solvent rinse or otherwise fix the glass?
    Would thinning my (low viscosity) resin help? If so, with what? (The less poisonous the better)
    Any advice gratefully received.
  2. ondarvr
    Joined: Dec 2005
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    Location: Monroe WA

    ondarvr Senior Member

    Buy different glass, it will cost far more to use glass that may not work.
  3. Anatol
    Joined: Feb 2015
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    Location: los angeles

    Anatol Senior Member

    not the answer I was hoping for :(
    So - what sizing is best with epoxy? and -
    What exactly does the sizing do?
    It's an odd, old-fashioned word. Last time I came across this usage was with gold leaf, and that was 40 years ago :) No - I wasn't gold leafing a boat, though its an interesting idea...
  4. PAR
    Joined: Nov 2003
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    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Most fabrics made now are fully compatable with epoxy, but some old style fabrics can cause issues. The things you can try aren't usually worth the bother. Sized egdes on tape is a common problem wiith these tapes. A good hard shaking can make a difference, but also tends tosrew up the weave a bit.

  5. rasorinc
    Joined: Nov 2007
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    Location: OREGON

    rasorinc Senior Member

    You have no ideae what you have so do as ondarvr says buy new.
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