cleaning between layers of glass

Discussion in 'Fiberglass and Composite Boat Building' started by naturewaterboy, Jul 13, 2007.

  1. naturewaterboy
    Joined: Sep 2006
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    Location: key largo, florida, usa

    naturewaterboy Steel Drum Tuner

    I've read several places to not use acetone to clean between layers of glass. Why is this? Does it just evaporate too fast, or is there some other reason. Can Naptha be used?:confused:
     
  2. mydauphin
    Joined: Apr 2007
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    mydauphin Senior Member

    Mix a 50/50 alcohol to acetone
    Real Alcohol not drug store kind
     
  3. ondarvr
    Joined: Dec 2005
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    ondarvr Senior Member

    How long has the first layer been left to cure?
    The sticky layer at the surface is what allows a better bond, if you remove it before applying the next layer, the bond won't be as good. If the surface has cured until there is no tack left, then cleaning it with solvent will have little effect and won't really improve the bond, it needs to be sanded before the next layup.


    I'm assuming you are talking about polyester resin and not about epoxy blush.
     
  4. fiberglass jack
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    fiberglass jack Senior Member

    what resin are ypu using
     
  5. mydauphin
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    mydauphin Senior Member

    I assumed everyone knew they need to sand


    Yes, you need to sand. I used acetone to remove moisture, my fingerprints, oils and dust. Mixing Alcohol gives you more work time.
     
  6. naturewaterboy
    Joined: Sep 2006
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    naturewaterboy Steel Drum Tuner

    I'm using epoxy - what I've been doing is clean the sticky stuff off with acetone then sand. Anyone use peel ply between layers? I heard about it back when I was into experimental aircraft, but my local supply house doesn't know what it is.
     
  7. fiberglass jack
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    fiberglass jack Senior Member

    peelply is the way to go, it will save on sanding big time, i use it regularly when i work with epoxy
     
  8. frastorno
    Joined: Jun 2007
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    frastorno Junior Member

    does the peelply works with polyester resins as well?
     
  9. naturewaterboy
    Joined: Sep 2006
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    naturewaterboy Steel Drum Tuner

    I did see that one supplier had two types of peel ply listed - one that was only for polyester, the more expensive was for epoxy and vinylester. They are two different colors -I think blue and white.
     
  10. JRL
    Joined: May 2007
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    JRL Im with stupid

    Nylon dress liner from wal-mart will work as peel ply. Just make sure you test it first.

    My favorite peel ply is made by Richmond Aircraft. Merritt Marine in Ft. Lauderdale carries it. You may have to buy in bulk though.

    USComposites up in West Palm carries your generic "peel ply" and it will work with any resin. They ship very quick.

    The difference between the two peel ply's you mentioned is probably coated vs. uncoated. Ive never heard of any peel ply being epoxy only.
     

  11. the1much
    Joined: Jul 2007
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    the1much hippie dreams

    acetone makes the "waxy" build up hard so you can sand it, they say not to because people tend to over-do it and too much will start eating your resin up,, even kicked off. to just clean, i use denatured alcohol , but if its cleaning before painting jus use a DAMPENED rag,, dont leave no wet streaks,,it will show up on your paint job
     
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