gelcoat over epoxy

Discussion in 'Fiberglass and Composite Boat Building' started by glassman, Dec 1, 2005.

  1. glassman
    Joined: Nov 2004
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    Location: Toms River, N.J.

    glassman Junior Member

    in finishing my 66 formula jr, had plans to gelcoat bottom but the pros and cons of gel on epoxy??? will it hold up,dont want to paint trailering .the rest of boat will be shot in awlgrip :confused:
     
  2. yokebutt
    Joined: Aug 2004
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    Location: alameda CA

    yokebutt Boatbuilder

    Use an epoxy primer/drysail bottom paint instead. The Interlux product with teflon will polish out to a high shine.

    Yoke.
     
  3. glassman
    Joined: Nov 2004
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    Location: Toms River, N.J.

    glassman Junior Member

    good but on and off the trailer ,looking for more of a hardcoat
     
  4. boatbuilder.org
    Joined: Jan 2005
    Posts: 54
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    Location: Olympia Washington

    boatbuilder.org Junior Member

    It is my understanding that it is not a good idea to put polyester over epoxy, I think there are adhesion issues. Epoxy over polyester is fine though. I have not played with polyester much so my comment is not from first hand experience.
    ---Joel---
    www.boatbuilder.org
    www.devlinboat.com
     
  5. Deering
    Joined: Feb 2005
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    Location: Juneau, Alaska

    Deering Senior Member

    From the System Three (epoxy manufacturer) website:

    Can I put polyester gelcoat over cured epoxy?
    In general, polyester resins won't cure properly or bond well to epoxy resin products without a "tie-coat" barrier resin in between. System Three SB-112 resin system can be used as a tie coat in between epoxy laminating or coating resins, and polyester laminating or gelcoat resins. Using this resin allows you to gelcoat an epoxy-built or epoxy-repaired boat.
     
  6. JR-Shine
    Joined: May 2004
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    Location: Vero Beach, FL

    JR-Shine SHINE

    Yes, we sell (and use) the S3 paints. You can use them over polyester (gelcoat) if you use their "tie-coat", but its not a good idea. If you have used epoxy on the bottom, then just prime/paint it with whatever paint system you choose (awlgrip or S3), there is no need to use gelcoat. In fact the bond will not be as strong if you use gelcoat.

    Gelcoat is a necessary evil of building a boat in a mold

    Joel (A different Joel than above:) )

    Boatbuildercentral.com
     
  7. glassman
    Joined: Nov 2004
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    Location: Toms River, N.J.

    glassman Junior Member

    thanks for the info looks like paint it is just have to watch when putting in and out of the water
     
  8. Grantman
    Joined: Feb 2005
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    Location: USA

    Grantman Junior Member


  9. makeitfly
    Joined: Dec 2005
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    Location: new zealand

    makeitfly Junior Member

    There are some excilent urethane two part paints on the market and they are usully harder than Gel coat . Check with the manufacturer about the hardness qualities and thickness required , This can be for the proper cure of the product when it is applied
     
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