I buy mine from Tim and Tracey at Woodnwhimsies. I cut them in half just as you said. I keep one set in a container of water for wetsanding and use the other for dry sanding. When I wet sand I use them all from 1500 to 12000. When I use them to buff out a ca finish I start with about 2400 so I don't sand through the ca. On wood, I dry sand and use them all. I will usually sand wood with Abranet up to about 400 then switch to Micro Mesh to finish.