doozer wrote:
I like the idea of thin slivers of pine (the boards are pine) glued up
and then banged into the gaps. The trouble is I have only found a few
posts on this which were fairly vague.

You can do this, but only glue one side of the filling strip. Try to use
a slightly darker timber if you can.


I actually bought some sealant and was going to give it a go on a small
section but chickened out at the last minute. I wasn't sure it would
match or that I would be able to get it out the gap if I didn't like it.

Silicone sealant isn't really suitable - you can't overpaint or sensibly
stain the stuff, and it's a pain if you smear the job, and a pain to get
off if you need to. Again, if you use a filler, use one a fraction
darker than the boards. I have used papier mache on boards, made with a
dollop of wallpaper paste in the mix. It's OK, and will sand/stain
easily. However, you are likely to get some cracking as the boards will
continue to move over the years.