Epoxy fairing over foam sandwich cores

Discussion in 'Fiberglass and Composite Boat Building' started by fallguy, Apr 28, 2019.

  1. fallguy
    Joined: Dec 2016
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    Location: usa

    fallguy Senior Member

    Say you want to fair a large area of hull 0.064".

    Is it necessary to precoat straight epoxy when fairing over large area of hull? Precoat and then allow to tack?

    Or if you rough the substrate and clean it well is that sufficient to just add fairing compounds?

    Does it make a difference if the substrate is smoother or rougher to start?

    This is for paint prep.
     
  2. Blueknarr
    Joined: Aug 2017
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    Location: Colorado

    Blueknarr Senior Member

    The only reason to precoat is if the substrate is porous. Prep in the same manner you would if applying an additional layer of lamination. You know that an un-etched surface lacks adhesion potential.
     
    Last edited: May 2, 2019
  3. fallguy
    Joined: Dec 2016
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    fallguy Senior Member

    What do you mean by etched surface lacks adhesion?
     
  4. Blueknarr
    Joined: Aug 2017
    Posts: 777
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    Location: Colorado

    Blueknarr Senior Member


    My bad. Missed proof reading.

    Should have said;
    Un-etched surfaces lack adhesion.

    Thanks for bringing it to my attention
     

  5. fallguy
    Joined: Dec 2016
    Posts: 2,836
    Likes: 292, Points: 83, Legacy Rep: 10
    Location: usa

    fallguy Senior Member

    Want to edit and clean up the thread?

    I will.
     
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