Polyester over vinylester resin?

Discussion in 'Fiberglass and Composite Boat Building' started by burke, Mar 28, 2017.

  1. burke
    Joined: May 2014
    Posts: 58
    Likes: 1, Points: 8, Legacy Rep: 16
    Location: Maine

    burke Junior Member

    Will polyester adhere to vinylester resin? I want to apply VE to a balsa core edge to seal it, thinking it will soak in better and seal out rainwater more reliably. Then follow up with poly resin and cloth and poly fairing compound.

    Thanks
     
  2. ondarvr
    Joined: Dec 2005
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    Location: Monroe WA

    ondarvr Senior Member

    It will bond fine they're 100% compatible

    Sealing it with VE prior to coating with a polyester laminate won't do anything to help waterproof it. It will be no different than doing the same thing with polyester resin.
     
  3. burke
    Joined: May 2014
    Posts: 58
    Likes: 1, Points: 8, Legacy Rep: 16
    Location: Maine

    burke Junior Member

    OK. Thanks.

    I don't have too much experience with VE. Unless the first VE coats soak into the balsa deeper or bond better to it, there is no reason to use VE.
     
  4. Stumble
    Joined: Oct 2008
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    Location: New Orleans

    Stumble Senior Member

    Not true. It is somewhat Formula specific, but polyester does not act a silly an effective vapor barrier vinylester does. It's the same reason that poly boats often get a vinyl top coat, in order to slow down water into the laminate stack.

    Epoxy is better than either of them, but has gelcoat bonding issues.
     

  5. ondarvr
    Joined: Dec 2005
    Posts: 2,614
    Likes: 372, Points: 83, Legacy Rep: 506
    Location: Monroe WA

    ondarvr Senior Member

    Sealing the balsa in this location with VE will make no difference.

    VE helps in long term immersion applications when used as a skin. Sealing foam or balsa above the waterline with VE will be of no help when used like this.

    Migration of water through a laminate and causing rot is a rarity. Water reaching a core through a screw hole is the real concern, and it makes no difference what resin is used in this this failure mode.
     
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