Filling Voids, Cracks, and Defects in Wood with Epoxy – Ask Matt #19

12 Apr Filling Voids, Cracks, and Defects in Wood with Epoxy – Ask Matt #19

I like to incorporate some goofy pieces of wood into my work.  Many of them have structural issues or voids that need to be addressed before they can be used in a project.  Epoxy works great for filling and stabilizing  knots, cracks, voids, and other defects in wood.

Products Used [Affiliate Links]:

West System Epoxy Resin (Gallon):
West System Epoxy Slow Hardener (Quart):
Metering Pumps:
High Density Filler:
Transtint Medium Brown:
Transtint Bright Red:

  • John Leonick
    Posted at 13:19h, 21 May Reply

    Do you have to completely clean out the knot before filling it?

    • Matt Cremona
      Posted at 04:42h, 25 May Reply

      No, the epoxy is thin enough to penetrate and encapsulate any dirt or debris.

  • Albert
    Posted at 13:19h, 30 July Reply

    Matt are you Maltese??

  • Albert
    Posted at 05:28h, 31 July Reply

    I am from St Julian’s Malta

  • Greg Wallwey
    Posted at 04:06h, 27 February Reply

    Matt, will this stop rot? I have a piece that was rotting inside. Was thinking of filling it to stop the rot.

    • Matt Cremona
      Posted at 05:33h, 28 February Reply

      It should if you can get the rotted area fully saturated

  • Ronald R. Hoppe
    Posted at 23:05h, 13 September Reply

    I recently received some “FREE” rough cut walnut and cherry, 6-8″ wide by 8′ boards. They have a lot of checks/cracks, some go almost all the way thru their length. How far can l go using epoxy to fill/repair these problems, or I’m I better off ripping, jointing, and glue them together again

    • Matt Cremona
      Posted at 18:01h, 18 September Reply

      You can go pretty far with it and fill all the defects to end up with structurally sound material. I look at it as more of an aesthetic decision.

  • Brian Moran
    Posted at 12:26h, 22 October Reply

    Matt, I have a 60″ long live edge walnut slab. It’s a 7/4 thick piece and there is an 18″ long crack, 5/32″ wide starting at one cut end. The 2 adjacent surfaces are about 3/32″ out of plane at the cut edge across the crack, but otherwise the slab is very flat. I’m thinking of temporarily clamping a straight edge across to remove the slight twist and then filling the crack with epoxy. Do you the epoxy will resist the twist and hold? Or do I just fill as is and re-surface.?

    • Matt Cremona
      Posted at 17:24h, 23 October Reply

      The epoxy will hold but you might have a bit of spring back. I’d try the holding it flat thing and just resurface after the epoxy sets if necessary.

  • Brian Moran
    Posted at 17:46h, 23 October Reply

    Awesome. Thanks Matt.

  • Christopher Trucksess
    Posted at 20:58h, 15 November Reply

    What trans tint color do you use for black walnut?

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