Your brand new "Cabin LIfe" cabin kit will need to be painted with a good quality undercoat and two coats of good quality paint or have 2 coats of a good quality sealer such as an "intergrain" product which can be purchased from any Bunnings store of your local paint supplier.
Some oils and wood penetration preserves like "Cutek" are good for decks but not good for our cabin walls as they do not create a good protection barrier against the elements.
It is also a good idea to use a joint filler like (Selly's No More Gaps" of "Caulk in Colours" to seal and any tiny gaps. We personally like to use a gap filler in all of the corners even though we know our water tight challet corners work very well the gap filler in the corners will stop small spiders nesting in the tiny spaces and will make you cabin look even more amazing once painted.
For your Cabin Timber Warranty you must properly paint or seal the Cabin kit within 3 months after construction.