Which has better adhesion....

Discussion in 'Fiberglass and Composite Boat Building' started by Roly, Feb 9, 2010.

  1. Roly
    Joined: Jul 2005
    Posts: 508
    Likes: 23, Points: 18, Legacy Rep: 222
    Location: NZ

    Roly Senior Member

    I understand the air retardation of polyester for subsequent coats but....
    Which has better adhesion....
    Mechanically bonded polyester to polyester. (I know this works)
    Or, mechanically bonded epoxy to polyester?

    Does the styrene content of polyester give it any more than a mechanical bond
    on fully cured polyester?
    Would vinyl ester be a candidate?
    I want to strengthen an already fully cured surfboard with carbon uni. down the stringer.
    I just snapped my favorite board.

    The thickness & density of current surfboard foam & the glass shell thickness form an unbalanced composite.
    Next board I make will have a balanced composite panel rebated in deck & bottom.
     
  2. lewisboats
    Joined: Oct 2002
    Posts: 2,329
    Likes: 126, Points: 0, Legacy Rep: 1603
    Location: Iowa

    lewisboats Obsessed Member

    Epoxy to polyester, sand the poly to give it tooth and the epoxy will do the rest. It is a better bond than Poly to poly.
     
    1 person likes this.
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