During the work, you can leave brushes with the bristles in crude linseed oil, so they do not solidify and harden. It is then sufficient to dry brushes well before the next use. When you have finished painting and the brushes are to be washed, concentrated linseed oil soap is the best option. The soap dissolves the color and cares for the brush. For a shorter time and between coats, brushes can be stored in a plastic bag in the freezer. However, storage should not exceed one week, and it is important that some paint remains in the brush to keep it from drying out. Note Do not forget that linseed oil-soaked papers and rags can ignite spontaneously. It is important to soak these items in water before disposing of them in combustible waste.