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I'd definitely opt for those long slivers/wedges over some kind of filler
That's what I was thinking, any recommendations on what to buy?
spenceey-
Ideally, you'd use wood as similar as possible to what's there already. Which would seem difficult when ordering online. I've never bought any, and would probably opt for doing them myself on a tablesaw. Not much help, sorry.
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If it is any help, I bought these the year before last:
First and only time I have done it so I have nothing to compare it to, but they certainly did the job. They sanded up quite light, about the same colour as the few bits of epoxy filler we also used in other places, so a bit lighter than the floor.
I lacked the skill to chisel them flat, the chisel kept diving into the floorboards on either side and making a gouge. I managed to do it with a multitool cutter in the end.
Just while I am here, Cupcakes we also sanded the floor after ourselves doing those repairs. We found the same thing - most decorators did not want to do it anymore and the few that did were booked up. If it is any inspiration I found it much more straightforward than many reports on the web suggest. My partner had done it once before so she did the edge sanding, which was definitely harder as others have mentioned above. I did the big drum sander and it was very straightforward, the thing about leaving bigs dents by mistake just did not seem a problem. It generated nowhere near as much dust as suggested. That was from a fairly thorough go at it, sanding off a fair bit of material to level out uneven boards & to shift old residues of the black gunk around the margins. A sheet duct-taped around the door kept the rest of the house dust free.
Nef
sifriday
I'd definitely opt for those long slivers/wedges over some kind of filler. Bona do acrylic fillers that come in a range of colours to match different woods. They remain flexible so while that's good for allowing movement, in any large cracks they'll be liable to damage. And any filler that sets hard will crack and fall out in big gaps. I used the Bona stuff on the very minor gaps I had ( < 1mm) and although I didn't get the colour spot on, I was happy with the results.