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.
I don't know whether they will dry in the same way, but from having just teak-oiled some outside furniture with a brush (as per the instructions), I'd say definitely stick with a cloth. It's far easier to get a nice light, drip-free application.
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.