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Thread: mdf question

  1. #1
    Join Date
    Dec 2012
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    victoria
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    7

    Default mdf question

    Can anyone tell me, is it ok to spray automotive primer over bare MDF. i want to use acrylic lacquer as a top coat. Thanks.

  2. #2
    Join Date
    Dec 2005
    Location
    Canberra
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    723

    Default

    Yes, and it works very well.

  3. #3
    Join Date
    Dec 2012
    Location
    victoria
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    7

    Default

    Thanks Mastersplinter. So the thinners does not create any problems with the bare MDF ?

  4. #4
    Join Date
    Dec 2005
    Location
    Canberra
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    723

    Default

    No - in fact after any routing and sanding, I wipe the surface down with automotive thinners or wax and grease remover to help get any loose MDF dust off it.

    If I'm using automotive acrylic, I tend to stick with car finish prep all the way - any filling is done with polyester (or much better, epoxy) bog, acrylic primer-surfacer for 'end grain" (or should that be 'end dust'?), and treat it much like a car panel with the exception of not wet sanding till there's a good number of coats built up.

  5. #5
    Join Date
    Dec 2012
    Location
    victoria
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    Default

    Sounds good. What size nozzle do you use on the finish coat? Any advice on spraying the finish coats would be appreciated.

  6. #6
    Join Date
    Oct 2003
    Location
    Sydney,Australia
    Posts
    42

    Default

    Yep, any water based finish can be a problem with regular MDF, at least with automotive lacquer you should also be proof against rings from wet glasses, which looks ugly real quick. Also second the recommendation to use filler on any cut edges before spraying the finish - it may look smooth but the first coat of finish brings out all the defects & problems.

  7. #7
    Join Date
    Dec 2012
    Location
    victoria
    Posts
    7

    Default gun type

    Also , sounds like the old type suction guns (star 770 style) are more suited to laquer than HVLP.
    Anyone confirm that?

  8. #8
    Join Date
    Dec 2005
    Location
    Canberra
    Posts
    723

    Default

    Suction or gravity fed.

    I prefer the gravity fed as I can lower the air pressure a bit more with heavier paint (ie primers) and have less chance of dry spraying. VG Autopaints can sell you a cheapie gravity setup with 1.4, 1.8 and 2.5 needles for $100 odd. Probably won't be the most comfortable gun to hold, but at that price it gets you started).

    (no association with them, I just think their instructional videos are good)

    ALERT - VEK Tools has the same kit for $79 - so if you feel inclined, support a sponsor of the Woodwork forums!

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