It was pretty heavily cracked and pitted, with knotholes and so on. But, I had a plan. Resin inlay. A technique traditionally used with a colour-matched epoxy to the wood, to give an "invisible" repair. I'm taking a slightly different approach.
First job, seal off the holes from the bottom, using aluminium plumber's tape. It's super sticky so it seals well, and it won't be damaged by the resin either. You might need these seals to hold for a few days, depending on the weather.
Make sure the wood is level, otherwise you'll end up with wonky resin bits.
Now it's time to mix the resin. Give it a good mixing and then add your pigment. If you warm it up a bit, on a heater or with a hairdryer or something, the bubbles will pop out of it much more easily. Bubbles can ruin resin casts, so carefully mix and warm the resin, then let it sit for a while, before pouring. It's going to take hours, even days, to cure, so half an hour to de-bubble isn't a problem.
Now it's time to get these up. The brackets are grey to match the colour the wall is going to be once it's been repainted. I had some bits of walnut around to make the other brackets.
I think this one is my favourite. It's on the bottom of the top shelf, so it's visible in normal use.
So there you go. Blue glow inlay into chestnut.
Unrelated link to my Etsy store.