I have a small room with a 90-year-old hardwood floor. I love the way that the old wood looks, but the large gaps between the boards are inconvenient. Since it's a small area, I can go with a labor-intensive method of restoration, so I'm thinking of going for a kintsugi look with the gaps filled in but not hidden. Would epoxy (dyed black) work as a filler material? (As described here.) Or is the wear and expansion/contraction of the floor too much for it?
Edit: What I have in mind is something like this.