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Yes it's the two-part stuff.
Downstairs I used some of the Amber Polyx tints and that did stain the filler a little, but the clear satin hasn't done much at all. I think the problem is that the filler goes on a good pale brown colour then turns white when you sand it.
I saw that Osmo do their own pre-mixed wood filler in a range of colours, but it seemed to be about £6 for a 200g pot.
tbc-
Yeah ours is the amber stuff so I can imagine anything paler won't do much.
Now you know why they can sell their filler for £6 a pot
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A bit late to this conversation, but have you looked at Humbrol enamels? I've used them to hide repairs in the past, and while not perfect it's been good enough. Other brands are available, also acrylics - my bias comes from having a local model shop with a proprietor who would spend ages matching colours to anything you put on the counter.
https://www.humbrol.com/uk-en/shop/paints/enamel-paints/finish/matt/colour/brown-cream-tan.html?
Two or three tins, a suitably fine brush and a bit of artiness might do it? They'll mix and blend with each other, and can be overpainted to get a closer match.
rhowe
MrE
Is that the two part filler? It doesn't absorb Osmo as well as the wood. Here's a photo of our floor with some filler over screw heads (all 2,500 of the fuckers) and in some old nail holes.
It's visible although not as strongly as in your photo and I don't mind it.
There are other fillers which I think will behave more like the wood. I think I tried mixing some Osmo into the filler but it was just too much of a pain - that stuff goes off so quickly and I was worried that it wouldn't set if it was adulterated.
I filled the more egregious bits with a pva & sawdust mix - wouldn't recommend. I left it sitting proud to protect against sagging and it was horrible to sand compared to proper wood filler although it took the stain well.