Resources.  Linseed oil. 

I am going to put up some useful links that relate to the use of linseed oil paint on timber windows.  What it is, why we use it and how to maintain it. The linseed oil we use is slightly different from the boiled linseed oil you find on the shelf. Here is a good link from Ottosonfarg that highlights  the difference between cold pressed and hot pressed linseed oil, and how it works to protect your wood. 

ottossonfarg.com/en/linoljefarg/basic-course-in-linseed-oil-paint/