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  1. #1
    Join Date
    Jan 2017
    Location
    Brisbane
    Posts
    13

    Talking Sealing MDF -non-greasy, acoustically-transparent

    I've made frames out of mdf and there are quite a few exposed edges.

    How should I seal the MDF?
    Should I seal only the edges or seal the whole surface?


    Please note that these frames are to be used for acoustic panels (sound absorbing) so ideally I'd like to have a non-reflective (permeable) surface, so nothing too hard and nothing shiny. These panels will be covered in fabric so the surface can't be greasy and I'll never be able to re-treat the wood after covering it.

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  3. #2
    Join Date
    Feb 2015
    Location
    Strathalbyn South Australia
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    1,141

    Default

    I would think any oil based or water based varnish would do the trick. 2 coats with a light sand between the first and second coat.


    Sent from my iPhone using Tapatalk

  4. #3
    Join Date
    Feb 2016
    Location
    Canberra
    Posts
    5,124

    Default

    Haymes Tri-Coat.. It's a sealer, undercoat and sand able base all in one.

    Virtually everything I make has some mdf in it and the tricoat has been used for years. It's very nice.

  5. #4
    Join Date
    Oct 2003
    Location
    Sydney,Australia
    Posts
    3,157

    Default

    If the boxes are totally covered in cloth and not exposed to moisture at all (like a cold glass on a humid day) then you really don't have to finish the boxes at all. If they are placed in areas of high humidity then a coat or two of some finish (spray cans give a light coat, lighter than brushing) will stop them going mouldy.

  6. #5
    Join Date
    Feb 2009
    Location
    Brisbane
    Posts
    3

    Default

    Just a comment: you don't need to worry about sealing the MDF. It has a hard & smooth enough surface that even unfinished MDF acts as an acoustic reflector at any frequencies where the finish would matter. The fabric covering (possibly with a bit of wadding or foam beneath) does all the high frequency absorption.

    While thin MDF panels with an air gap behind can act as a low frequency absorber, the finish on the MDF won't affect that, as it relies on the whole panel bending.

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