gelcoat substitutes

Discussion in 'Boat Design' started by K-36-canvasback, Mar 1, 2008.

  1. K-36-canvasback
    Joined: Sep 2007
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    Location: B.C Canada

    K-36-canvasback canvasback

    I am preparing to make a part in a mold.the mold surface is regular gelcoat & will be waxed with mold release.The part will be fiberglass hand laid into epoxy resin.I would like to know if there are other options for the colour coat.perhaps a two part polyurathane.am concerned that the epoxy wont bond to it or even if epoxy will bond to a polyester gelcoat.Anybody have experience with this?
     
  2. Landlubber
    Joined: Jun 2007
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    Location: Brisbane

    Landlubber Senior Member

    You can bond epoxy to polyester quite well, not the other waty around.
    Epoxy over a poly gelcoat is quite OK.
     
  3. K-36-canvasback
    Joined: Sep 2007
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    Location: B.C Canada

    K-36-canvasback canvasback

    Any idea about using Awlgrip or Endura for this same purpose.I was wondering if these two parters will lay onto the waxed mould or if there would be a negative reaction to the mould release.Also will the epoxy then bond to it without sanding?
     
  4. Landlubber
    Joined: Jun 2007
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    Landlubber Senior Member

    Mate, you have no hope on earth of syraying a twp pack linear ployurethane paint onto a waxed mould.

    It will fisheye like you have never seen.

    Stick with the gelcoat, it is heap and good, and then paint the product upon release if you must.
     
  5. K-36-canvasback
    Joined: Sep 2007
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    Location: B.C Canada

    K-36-canvasback canvasback

    Landlubber..Thanks for the info.I was wondering about the fisheye thing.Trial and error can get expensive!
     

  6. GG
    Joined: Jan 2008
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    Location: MICH

    GG offshore artie

    there is a product that is sprayed over jelcoat while it is in the mold & it is called POLYBOND . Douglas Marine /Skater uses this product , because they experienced bond issues with jelcoat on there ( epoxy ) parts G.G.
     
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