I have a glass shelf I want to use as a flat plat for 3M abrasive film for sharpening chisels and Plane irons. The shelf is 12" wide and 48" long and about 1/2" thick. Can I cut it in half into two 2' long pieces. The longer pieces are somewhat heavy and unwieldy.
What are the chances the shelf is tempered? If it is tempered would it be marked? BTW the edges are round and polished. So, can I just use a glass cutter and put a scratch across it and snap it?