Sanding wood floor - DIY or pay?

Nice work @mervan46

I forgot to post my floor sanding experiences a few months ago.

We had a very tatty parquet flooring in our hallway, I bought one of these belt sanders:

https://www.screwfix.com/p/makita-m9400-4-electric-belt-sander-240v/4558R

They are a bit of a beast but made light work of the floor. I then used Bona Classic Primer followed by two coats of Bona Matt Mega Varnish.

That is nice. Must be well satisfying bringing it back to life.

Another floor sanding question. We have tongue and groove floorboards so can't use the traditional wood sliver filler method, whats the best way to gap fill these/product to use?

Also, we'd like to add a little colour and there are tinted Osmo products (PolyX Tint), can I be lazy and just do a few coats of that, or must I use a tinted primer?

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I'd have thought you can still glue in a patch of replacement wood then sand flush.

Alternatively I'd use a black wood filler. Osmo do an Ebony one - given most of their product line is decent and it's only a small spot it's probably worth it.

The chap who did our iroku floor used a 2k resin and the fine sanding dust as he said that while it stinks and the working time is shorter it was a better product than the water based ones.
For the painted pine boards I used water based wudcare gap filler and the same dust which was too dark but as I was painting the floor it didn’t matter.

I've recently done ours which was about 600sqf of maple. I used this - https://restorate.co.uk/products/jenkins-gel-joint-gap-filler which you mix with the finest grade leftover dust. Its holding up so far but hasn't been done long.