Kahrs White 01 Satin Oil is a urethane modified oil for use on Kahrs Oak Olof. Shelf life is up to 2 years but greatly reduced once container is opened. Keep Kahrs floor satin oil in the original container with lid tight and in a temperature controlled space, 14°-28°C / 58°-82°F. Oil will harden in the bottle when stored after opening, often in less than 1 year.