I have used it a couple of times. A real pain to cut, dremel type cut off wheels work best. Brittle when you try to drill it but sharp carbides work well, just don't expect long life from your bits. Use new belts to shape. Fill voids with superglue or epoxy. I take the belts to 600 then polish with CR51 at 1750 rpm. Charles Turnage is a good lead. He has great materials and probably some great pointers, I just never thought to ask him. KDC