How to seal XPS or EPS?

Discussion in 'Materials' started by MassimilianoPorta, Feb 17, 2020.

  1. MassimilianoPorta
    Joined: Apr 2019
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    Location: Italy

    MassimilianoPorta Junior Member

    Hi,
    what is the easiest/cheapest way to seal an XPS or EPS surface so it can be used with a polyester resin without dissolving the foam?
     
  2. dinoa
    Joined: Oct 2007
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    Location: florida

    dinoa Senior Member

    Acrylic emulsion paint
     
  3. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    There is a polyester than can be used with polystyrene foam these days, you might find it in the Duratec line-up. Maybe once coated, revert to normal polyester. Member Ondarvr here would be your best guide to that.
     
  4. MassimilianoPorta
    Joined: Apr 2019
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    Location: Italy

    MassimilianoPorta Junior Member

    Thanks, I will give it a try
     
  5. MassimilianoPorta
    Joined: Apr 2019
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    Location: Italy

    MassimilianoPorta Junior Member

    Unfortunately it looks like I cannot find any Duratec product in Italy :-(
     
  6. Mr Efficiency
    Joined: Oct 2010
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    Mr Efficiency Senior Member

    ►Polystyrene Compatible Resins
    Tricel Composites offer a polyester resin that can be used directly on the polystyrene block, or sheet, without attacking the surface.
     
  7. MassimilianoPorta
    Joined: Apr 2019
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    Location: Italy

    MassimilianoPorta Junior Member

    Will have a look, thank you
     
  8. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    I think if you make enquiries with local suppliers, you may find a compatible polyester of some kind, I guess it then becomes a question of whether you have to use that particular resin, or ordinary polyester will be compatible with the sealing one, for further lamination.
     
  9. Rumars
    Joined: Mar 2013
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    Rumars Senior Member

    Papier-mâché made with PVA glue will work.
    The special polyester resin made for xps usually costs about the same as epoxy.
    You might consider using PU foam instead of XPS.
     
    Dejay likes this.
  10. MassimilianoPorta
    Joined: Apr 2019
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    Location: Italy

    MassimilianoPorta Junior Member

    I will give acrylic emulsion paint a try, if unsuccessful I will try other methods

    Thank you for suggesting
     

  11. philSweet
    Joined: May 2008
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    Location: Beaufort, SC and H'ville, NC

    philSweet Senior Member

    The easiest, simplest and cheapest is to use epoxy. It doesn't cost any more than decent polyester resin.
     
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