Our son is doing a metal fab program through high school and this year they required masks, safety glasses, gloves etc. I took the opportunity to get myself a mask. Now I just need to use it. Smelling and tasking sanding dust (Alum Oxide, brass and steel) all night is probably a good indicator that a mask should be worn.

Looking forward to a review of the blue grit. I still have a couple rolls of Pferd that I got from Hardwicks. I'm sure it will last me another few years but, it's good to plan ahead - my wife says.