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  1. #1
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    Mar 2008
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    Townsville, Nth Qld
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    Default Best way to seal plywood and chipboard edges?

    Can anyone please advise on the best way to prevent the ingress of moisture on the edges of chipboard, MDF and plywood? I am looking for a coating, rather than applying edging.

    I am open to all ideas and suggestions.
    regards,

    Dengy

  2. #2
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    Nov 2007
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    belgrave
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    Not sure its really possible to completely stop it. Paint the edges with oil based paint might slow it down a bit. If its gonna get wet you might need to use something else.
    anne-maria.
    T
    ea Lady

    (White with none)
    Follow my little workshop/gallery on facebook. things of clay and wood.

  3. #3
    Join Date
    Nov 2006
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    kansas mostly
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    I deal with this at work. We use an exterior silicon caulk/sealant. It still doesn't stop it completely but does extend the time to replacement.

    ron

  4. #4
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    May 2003
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    Central Coast, NSW
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    Default

    Wouldnt marine epoxy be the best thing. Thats what its designed for.

    Arron
    Apologies for unnoticed autocomplete errors.

  5. #5
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    Apr 2011
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    McBride BC Canada
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    Default

    What are the service conditions? Indoors or outdoors?
    Solid woods stand a better chance of dying slowly when compared with veneer/particle mass.
    Far too expensive for small jobs but for outdoor service, like tables, chairs, log homes, etc
    Sikkens Cetol is #1, #2 and #3 choices.

    Epoxy might be OK if you can dilute it 10% with some sort of solvent, up the catalyst and
    hope some soaks in before it sets. We used propylene oxide.

  6. #6
    Join Date
    Mar 2008
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    Townsville, Nth Qld
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    Default

    Will be used indoors. No one has suggested shellac, possibly thinned to sanding sealer dilution?
    regards,

    Dengy

  7. #7
    Join Date
    Dec 2005
    Location
    Canberra
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    723

    Default

    Marine epoxy.

    Weight gain of bone dry test sample (with three coats of epoxy) after 8 weeks at 40 degrees C and 100% relative humidity - about 6%

    If you want better performance, you'll have to coat it with paraffin wax.

    WEST SYSTEM - Projects - Moisture Exclusion Effectiveness

  8. #8
    Join Date
    Mar 2008
    Location
    Townsville, Nth Qld
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    Default

    I have some Sikkens Cetol left over from when I painted my front door a couple of years ago. My understanding is that it is basically a stain that is waterproof, but it is 'micro-porous' and allows the timber to breathe.

    I thought it excellent for the tightly grained door surfaces, but would not be much good for the edge grain of chipboard and plywood, which is my problem area. I am very willing to stand corrected here.
    regards,

    Dengy

  9. #9
    Join Date
    Nov 2006
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    kansas mostly
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    Default

    More information please, if it's indoors what conditions are you concerned with?

    Ron

  10. #10
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    Mar 2008
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    Townsville, Nth Qld
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    Default

    It will be used in a shed, which is not air tight. We have very high humidity in the tropics, 100% quite normal on early summer mornings, so don't want the chipboard and ply soaking up moisture from the atmosphere , swelling and deteriorating. And now with our summer monsoonal wet season approaching, it is important that the edges are sealed.


    It is for the edges of the horizontal pressure panels on this veneer press.

    press_01.JPGpress_06.JPG
    regards,

    Dengy

  11. #11
    Join Date
    Nov 2006
    Location
    kansas mostly
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    Default

    If you don't expect water to condense resulting in direct contact with the chipboard and ply than anything that seals the edges should work. That could be shellac, glue, caulk, epoxy, paint, wax, oil, the list goes on.
    Given the application, I'd be tempted to wax everything (with the idea of preventing any glue from the veneering process from sticking to any part of the press).

    ron

  12. #12
    Join Date
    May 1999
    Location
    Tooradin,Victoria,Australia
    Age
    74
    Posts
    2,515

    Default

    We have used fibreglass body filler to seal the edge of plywood and chipboard but you may have a keying problem on MDF.

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