All of the above are correct, however I’m suprised that no one mentioned Japan Drier, which accelerates the polymerization process which results in a harder finish. Additionally it is important to use fresh linseed oil, as it will slowly build once the can is opened and the oil gets exposed to more air. Also never apply linseed oil to the inside of a drawer, as the lack of air circulation will result in a stickey mess that will never harden even if it is later put out in the open. Unlike varnish or shellac, linseed oil needs to be re-applied after a period of time as time, absorption and the elements take it’s toll faster than with other finishes. There is no denying that when the old timers put 6 coats of linseed oil on an exterior surface like redwood, they really knew what they were doing.