Hi There,
I make work that is sgraffito carved, most of which I try to do when the piece is leather hard but sometimes it's a little drier than I'd like. I am very concerned about silicosis. In the last couple of years, I have been wearing my respirator when I carve. It's a msr mask with p100 filters. Recently I met another sgraffito artist who suggested that unless I am replacing those cartridges VERY regularly (she suggested weekly or more) then it traps dust and does more harm than good. So she has switched to a regular dust mask that she replaces daily. I can't imagine that is true bu