Anybody know a way to make a reasonably sooth cut in Hardiboard (backerboard)? I've been experimenting with cutting a piece donated by a neighbor by scribing and snapping it off. The edges are a little more raggedy than I would like. Would like to figure a way to cut curves, and smooth edges on this stuff. The manufacturer recommends against using any kind of power tools due to the hazard from silica dust in the cement. I imagine this stuff would ruin a saw blade pretty fast due to being abrasive. Any ideas would be appreciated.