Did you get much warping? I've tried Yakisugi on something a little more precise than a planter box and had some issues.
Using the Yakisugi technique to seal a planter box for kitchen plants.
#grownostr https://video.nostr.build/0dce24fcba5d3659321cab4429526a8b816155e21ed61cea369238ebaf2ecc5d.mp4
Did you get much warping? I've tried Yakisugi on something a little more precise than a planter box and had some issues.
No warping. Pretty thick fir.