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I always use a 4” foam roller for Omso. Mainly planed oak / birch ply furniture though - could be annoying for nooks and crannies on stairs but defo the best application method. Once oil-soaked, 4” rollers keep for a long time of wrapped up properly in plastic. I actually use a washed out mini Innocent smoothy bottle to keep wet rollers in.
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Osmo recommend a microfibre roller so I tried that for the flooring and it ended up with a few patches where I'd over-applied.
I might go back to a roller for the anti-slip on the stairs though as I'm worried a cloth might affect its anti-slip properties which I assume is some sort of particle it contains.
That's super helpful, I had no idea, would probably have just painted it like anything else.
Will post photos when it's done - which may be weeks given how much sanding there is to do