What is this?

Discussion in 'Fiberglass and Composite Boat Building' started by Vendy, Sep 2, 2022.

  1. Vendy
    Joined: Sep 2022
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    Vendy Junior Member

    Hi guys ,

    i saw this video on the internet.
    And just wondering what is this ? And what it is for ? they applied those coat after gelcoat?

    Fyi , infusion lamination .
     

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  2. fallguy
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    fallguy Senior Member

    My guess is a pilothouse top.
     
  3. jehardiman
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    jehardiman Senior Member

    To me it looks more like a hull liner...but we digress...

    Context is everything. Could you point to the video URL? I assume you are talking about the black compound... Is it over the gelcoat but before the lamination, or after the lamination?
     
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  4. Vendy
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    Vendy Junior Member

    Unfortunately I don't really have the video .
    Yeah the compound i was wondering what was that
    It's after gelcoat before lamination ?
    My concern is: what kind of coat was that? thanks
     
  5. Vendy
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    Vendy Junior Member

    I mean after the gelcoat. Before lamination
     
  6. jehardiman
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    jehardiman Senior Member

    Then probably a barrier coat to reduce print through and improve osmotic blistering resistance.
     
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  7. Vendy
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    Vendy Junior Member

    If it is a barrier coat ? Do they need to do the tie layer (chop gun/ hand layup) ?
    Or they can start laying up the glass (prep for infusion) ?
     
  8. Blueknarr
    Joined: Aug 2017
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    Blueknarr Senior Member

    Barrier coat would also prevent infusion resin from attacking the gel coat.

    Could go directly to infusion.

    Might need mat layer.

    Might include mat in infusion.

    Depending on resin systems used.
     
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  9. Vendy
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    Vendy Junior Member

    so
    Gelcoat - barrier coat - laying up glass (include CSM)
    What happen if it without CSM ?
     
  10. fallguy
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    fallguy Senior Member

    Probably print through..
     
  11. KD8NPB
    Joined: Mar 2018
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    KD8NPB Senior Member

    It’s possible to direct infuse on barrier coat.

    skin coat is recommended though.

    best profile;
    Gelcoat
    Barrier coat
    Mod VE skin coat
    Mod VE skin coat (again)
    Infuse
     
  12. Vendy
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    Vendy Junior Member

    thanks for the information.
    So I can do it
    Gelcoat - barrier coat- infuse

    what will happens if no skin coat ?
     
  13. gonzo
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    gonzo Senior Member

    Sometimes a dark gelcoat is sprayed inside of the exterior light color to prevent translucence.
     
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  14. KD8NPB
    Joined: Mar 2018
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    KD8NPB Senior Member

    Prerelease of the gelcoat is the biggest risk.

    It will be difficult to attain a Class A gelcoat finish off the mold because of the exothermic temperatures of trying to apply a large quantity of material in one go.
     
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