Alec coats his handles in either canola oil or olive oil. Personally,I don't think it maters what kind of oil. Another advantage to charring a handle, it the water evaporates out, then you can replace the water with oil. That way your handles won't dry out, and the heads won't come lose. That's nice here in Alberta because in winter we have NO humidity, and my handles don't dry out because the swelling of the handle is upheld by oil not water. So if your handle soked in all the oil, in my experience, that's a good thing!