1

I recently assembled a shed and one or two of the board on the wall are "leaking" sap:

enter image description here

I thought it might stop after I removed the first batch but a few days later, it came back. Is there anything I can do to stop this (while still preserving the natural wood look)?

I've already put three coats of polyurethane over the whole interior.

3

It's a pitch pocket.

Just give it time - "a few days" is not much time in this case - it might ooze for a year before it gets done. You could try heating it (to make it ooze out faster), but that might have detrimental effects such as checking, a.k.a. cracking; or in this case, cracking more.

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I agree. It will eventually stop. This may sound extreme, but since it's localized around the knot couldn't you use a small mortise-type drill bit (the type that leaves a flat bottomed hole) to remove the offending sap knot and then fill with putty?

  • Putty ≠ natural wood look. – Ecnerwal Sep 8 '15 at 1:18

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