Osmo Poly x Oil on Flooring

Hi! I’m going to be putting osmo polyx oil on my floors. They are white pine.

What I would like to know is, what would be best to use for application and buffing into the wood? It’s a small room but I plan on doing the rest of my second floor eventually. There are also slightly large gaps between the boards because it is an older house so I want to avoid wasting a lot in the cracks. I’ve refinished a lot of furniture but this is my first time doing a floor like this.