Ugg... Don't talk about fiberglass dust. I demo'ed my kitchen 10 months back and when removing the ceiling all the loose fiberglass (60 year old batts) came down and crashed on the floor blowing fiberglass dust all over the place. I was wearing one of those little disposable masks and it did nothing to protect my lungs. After a few minutes of breathing that air I had to run outside, cough up a lung, and call my wife to pick me up a respirator style mask. With the better mask I was fine, but I was still coughing up my lungs for about a week after I was done.I think it was Jerry, one of those Jenkins-Martin guys, once talked about how sanding fiberglass shells gave off this horrible fiberglass dust that made his skin itch horribly. Makes me itch just thinking about it.