I use it according to his book . I use sunflower oil. It works great for me. As for whether it sprays as a mist or a stream, we can do both(unintentionally) depending on how fast we press the button. If we  press it slowly, it comes out as a stream. If you press it fast, it comes out as the most. You’d expect the button to just press down a little, but it presses in pretty deep. So look at the book and use it as directed.