I worked some obsidian for the first time this weekend, (very sweet compared to
Johnstone ). I kept my deerskin pad on my leg even when doing my pressure work just to keep the little glass shards out of the fibers of my jeans(that's really irritating). Call me a wuss, but I also had on some safety glasses and a mechanic's padded-palm work glove on my left holding hand.
I've never used it with stone, but when it comes to glass, I'm kind of skeerd.
I also clean each flake off my pad, not so much to keep from cutting myself but I like to look at them to see how the turned out.
Otoe