To guard against penetrating water, fats and dirt, each DamPlank is treated with several finishing coats of grapeseed oil. It's a good idea to continue oiling your DamPlank now and then, especially at the start when it can still absorb a lot. The best oils to use are odourless types like grapeseed and linseed oil, or other types that are suitable for wood. The advantage of these oils is that they harden slightly in the wood. Olive oil is a possible option, but it does remain slightly sticky, has a stronger odour and colour and may become rancid.