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  1. #1
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    Any tips on sealing MDF?

    Iím looking for tips on how to seal the edges of borg bought MDF to achieve a glass smooth paint finish. Iíve heard of mixing yellow glue & water. Are there alternative methods?
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  2. #2
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    I've used lightweight joint compound several times and it seems to work fine. Just smear it on with your finger or flexible plastic spatula, let dry, then sand. Inspect, repeat where needed.

    John

  3. #3
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  4. #4
    +1. Shellac is perfect for this.

  5. #5
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    Iíve tried Zinsser spray on shellac and it never has worked for me, maybe I needed more coats. Iím going to try the joint compound and see if that works on some small signs for my daughters church.
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  6. #6
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    The spray shellac, while handy to have around, has never really been a replacement for Seal Coat in my shop. I use it for many things. A shellac primer like Zinsser BIN may do two jobs at once for you prior to painting.
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  7. #7
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    Something that's now on my radar for this kind of thing as well as grain filling on guitar bodies is Z-Poxy.
    --

    The most expensive tool is the one you buy "cheaply" and often...

  8. #8
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    Quote Originally Posted by Jim Becker View Post
    Something that's now on my radar for this kind of thing as well as grain filling on guitar bodies is Z-Poxy.
    Jim - this is a new one to me. Can you tell us a bit about your experience with Z-Poxy?

  9. #9
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    Quote Originally Posted by Ted Phillips View Post
    Jim - this is a new one to me. Can you tell us a bit about your experience with Z-Poxy?
    I just bought some to work with, but the guitar building crowd raves about it. It's designed for grain filling as well as a thinner clear surface. It sands out nicely. It's not hugely expensive to try...available on Amazon. I have a sapele guitar body I'm going to do "first use" on with the product shortly.
    --

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  10. #10
    BIN primer has worked very well for me for this purpose. If the MDF is low grade like the box stores sell, you might have to apply it, sand back, and apply it a second time. BIN sands very well and it is shellac based by the way.

  11. #11
    Quote Originally Posted by Jim Becker View Post
    I just bought some to work with, but the guitar building crowd raves about it. It's designed for grain filling as well as a thinner clear surface. It sands out nicely. It's not hugely expensive to try...available on Amazon. I have a sapele guitar body I'm going to do "first use" on with the product shortly.

    Which z-poxy are you refering to ? They have about 4-5 different kinds.

  12. #12
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    Quote Originally Posted by glenn bradley View Post


    Does shellac really seal the edges?

    John

  13. #13
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    I have used Zinsser's Sealcoat and wipe-on poly.
    Ken

  14. #14
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    I can't answer for Glenn but I've done the same. Shellac sealed the edges but it took multiple coats. Just kept at it until it looked right.

    And the magical BIN primer also worked.
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  15. #15
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    Back when I was making painted pedestals all the time, regardless of the material - ply, solid lumber, MDF - my process was the same: assemble with carefully aligned joints, either joint compound or Rock Hard Water Putty, sand, KILZ, paint.
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