Twice with the rotary. First cut day after I bought it and was working in the salon at that time. First client of course was a perm. Nothing but chemical processes all day. Thank God for gloves. 2n time 2 weeks later with someone else's rotary cutter. Then I noticed it was rusty. Off to drs office for a booster. My friend's rotary cutter so close to her birthday so I bought her new blades and pitched her other ones. My glove is always right near my rotary cutter. In face I stick my rotary cutter in my glove. I have a fileting glove for fisherman.