I've worked with MDF before and your comments are known to me, but it is good to point it out for someone else that may read this. I remember many years ago when I first used it when I used it to make my control panel for my MAME arcade. I used a forstner bit. With regular wood, it makes a nice clean cut. With MDF it is also a clean hole but the MDF comes out like a giant spiral. Pretty neat, but any cutting or drilling or even looking at the stuff funny makes a huge fine dust mess that carries toxic junk into your eyes and lungs without protection. Even when cutting outside with a light breeze to blow some of it away, it is still nasty.
Good point on the sealing of it too.
