Using lead white can be scary at times. I use it often in my painting and I'm careful while doing so, but it becomes a little more alarming when I work with large batches. The good thing is that I use lead white already suspended in oil so I don't have to worry about having the pigment's particles in the air. Kremer's lead white is a beautiful warm color, but way too oily. Unlike paint, the ground is supposed to be more stiff, and to decrease the high oil content of this mixture I add chalk. This also makes the ground more absorbable.
So far I was only able to prime two canvases, I still have about twelve more to go. Looks like I'll be doing this for a while!