Epoxy surface coat in a mould

Discussion in 'Materials' started by hospadar, Sep 13, 2017.

  1. hospadar
    Joined: Apr 2011
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    Location: Michigan

    hospadar Junior Member

    I'm moulding some small epoxy/glass parts in some home-made female moulds.
    I'm wondering about applying epoxy surface coats on the inside of the mould like you would do a gel-coat in a polyester layup. I'm interested in doing this so I can come away with a thick, smooth epoxy layer on top of the fabric that a) looks nice and b) I can do cool stuff like glitter-ize or color (same reasons people gel-coat I imagine).

    Do people do this?
    How is it done? I'm imagining something like mould->wax->pva release film->coat of regular epoxy->first layer of fabric/resin. Any special techniques? Should I use something other than plain old epoxy?
  2. ondarvr
    Joined: Dec 2005
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    Location: Monroe WA

    ondarvr Senior Member

    Epoxies don't weather that well, they tend to become dull and turn yellow very soon after being put out in the sun, that's why they aren't frequently used in this way. There are epoxy compatible polyester in mold coatings that can be used.
  3. jorgepease
    Joined: Feb 2012
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    Location: Florida

    jorgepease Senior Member

    If you go with prepreg they have sheets of epoxy which you lay up first to give you that extra layer. People also use clear coats after the fact with metallic particles etc
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