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  1. #1
    Join Date
    Feb 2009
    Location
    Ladysmith South Africa
    Posts
    4

    Question Sealing MDF board

    I make small items . Dolls cots Toy garages using MDF board . We call it supawood in South Africa . I would like to know an effective way to seal the cut ends from just absorbing coat after coat of spray paint . Hand painting the ends is laborious and leaves runs on the smooth surface . is there a mixture I can rub on ?. No water based product as end immediately swells .

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  3. #2
    Join Date
    May 2003
    Location
    Central Coast, NSW
    Posts
    3,330

    Default

    Spackle, wallboard plaster or whatever else you want to call it works well.
    Apologies for unnoticed autocomplete errors.

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

    Default

    Being in SA I'll not mention brands (that would be useless) for purchasing, but so you can look up their properties.

    There are 4 main ways of doing this.

    -- A proper tricoat paint. It acts as a sealer, undercoat and sandable base. Haymes TriCoat is the product I use. (1)
    -- Car bog. Ordinary crash repair filler from SupaCheapAuto. Put it on with your finger, wait until it is "green" (i.e. before it gets fully hard) and shape it. Sand it to shape/size once fully hardened. (2). Car Bog is what professional speaker installers use in the auto industry.... all auto speakers are made of MDF and presentation is critical.
    -- A home made recipe of either: watered down titebond glue painted on, shellac (it dies well, fast, is hard and sandable) or a product called "MODpodge" which dries quickly, dead smooth and sands reasonably well.(3)
    -- Drywall compound. The fine finishing paste that comes pre-mixed. Use the "finish" or "topping" one, it is very fine (4)


    Above is my order of preference. I use MDF a LOT.

    The car bog is good for shaping, fixing mistakes and making speaker bodies. The Gyprock Topper is bloody excellent and does an outstanding job.

    All these methods will give you a dead flat, dead smooth surface (after sanding) to apply either an undercoat or the final topcoat to (for #1).


    (1) Product Information - Haymes Paint
    (2) SCA Lightweight Body Filler - 500g - Supercheap Auto
    (3) https://www.spotlightstores.com/craf.../BP80078525001
    (4) https://www.bunnings.com.au/gyprock-...pound_p0736156

  5. #4
    Join Date
    Apr 2013
    Location
    Sydney
    Posts
    1,556

    Default

    I have found sanding with power sander, either Random, ROS, palm sander, or painstakingly hand sanding. I have found that power sanders generate frictional heat and thus melts the binding product in the MDF to then become as sealed as the face of an MDF board and wont soak up ay paint. give it a crack.

  6. #5
    Join Date
    Nov 2012
    Location
    SE Melb
    Age
    64
    Posts
    1,277

    Default

    Quote Originally Posted by woodPixel View Post
    Being in SA I'll not mention brands (that would be useless) for purchasing
    I thought that's not being very nice to South Australians. And then I look at OP's location...... SA can mean so many things......

  7. #6
    Join Date
    Feb 2009
    Location
    Ladysmith South Africa
    Posts
    4

    Default

    Thank you all make sense never thought to go the body shop route . will try to get the equivalent in ZA .

  8. #7
    Join Date
    Feb 2009
    Location
    Ladysmith South Africa
    Posts
    4

    Default

    Sorry have a son in NSW so know the confusion . ZA

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