woodworking-hacks-to-fill-knot-holes-and-cracks-with-black-epoxy

Woodworking Hacks To Fill Knot Holes and Cracks with Black Epoxy

When you’re building a project out of a knotty or rustic wood like alder, pine, mesquite or hickory, you can give those boards a fantastic boost in stability and appearance by filling the cracks with wood filler, glue mixed with sawdust or epoxy. Probably other substances, too.

For this demonstration, we’re working with clear two-part liquid epoxy, which is easy enough to buy at your nearest hardware store. And the sample boards you see in these pictures are knotty alder. But, as stated above, the process works just fine in other woods with knots or splits. woodworking tips and techniques woodworking tips and tricks for beginners

We’re also tinting this epoxy with black pigment by Mixol. But that’s optional. You could leave the epoxy clear, mix it with saw dust, mix it with powdered stone like turquoise, and so on. The process is more or less the same. woodworking tips and techniques woodworking tips and tricks for beginners

Materials needed:

  • Two-part liquid expoxy
  • Black tint or pigment
  • Small disposable mixing cup
  • Stir sticks or disposable spoons
  • Needle or pin
  • Latex gloves
  • Blue masking tape
  • Denatured alcohol
  • Black felt tip marker

The Process:

First, some tips. It’s best to do this process before your project is assembled and before it’s sanded, stained or finished. You’ll do those things after filling. It’s perfectly fine to stain and apply finish on top of cured epoxy. Sometimes you’ll want to fill knots or cracks before you cut your boards to size if they’re severe and would pose a safety hazard otherwise. woodworking tips and techniques woodworking tips and tricks for beginners

Mix small batches rather than large ones, even if you have a lot of knots to fill. That’s because once epoxy is mixed, it only gives you about 5 minutes of working time before it starts to harden. woodworking tips and techniques woodworking tips and tricks for beginners

Step 1

If the knots or cracks go all the way through your board, flip it over and cover the backside of the void with masking tape. This helps prevent a nasty mess leaking through, or worse your board getting glued . to your workbench.

If the knots or cracks go all the way through your board, flip it over and cover the backside of the void with masking tape. This helps prevent a nasty mess leaking through, or worse your board getting glued to your workbench.woodworking tips and techniques woodworking tips and tricks for beginners

Step 2

In a small disposable mixing cup, mix your epoxy. The mix is usually 1:1 hardener to resin, but check the instructions on your epoxy. woodworking tips and techniques woodworking tips and tricks for beginners

As soon as the two parts come in contact with one another, you’ve initiated the hardening reaction. You have about 5 minutes before the epoxy is too stiff to manipulate into the cracks.

In a small disposable mixing cup, mix your epoxy. The mix is usually 1:1 hardener to resin, but check the instructions on your epoxy

woodworking tips and techniques woodworking tips and tricks for beginners

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