Outdoors, wood faces three attacks. The sun — its ultraviolet — breaks down the surface and greys it: that is the silver patina of teak, larch and oak left bare. Rain swells the fibres, dry weather shrinks them, and that to-and-fro splits the end grain, lifts the surface and opens the joints. Damp shade — the foot of a north wall, the underside of a table — holds water and lets green and black settle in.
An oil removes none of this; it slows it down. It feeds the fibre, sheds water as long as it beads, and renews without sanding: when it wears, you put on another coat, where a flaking film means starting again. In exchange, it asks you to come back every year. The wood must be dry — below 18% moisture — and the day mild: oils do not dry in the cold.
Three products in the range go outdoors, and three only: Danish Oil, Durax Teak Oil and Hard Wax Oil, which is UV resistant and spill proof. Nothing else: no wax, no varnish, no shellac, none of the other oils.