We’ve seen and experienced varied results when using or not using masking on various materials.
A current thread about leather getting “blown out” on the back side has me thinking - this is a common problem when cutting, milling, or drilling wood; and in many instances, a sacrificial backing board is used to prevent the underside from chipping along the edge.
I wonder if we could use various backing materials to help in situations like this? Perhaps chipboard behind leather, for example. We don’t need to worry about cutting thru the backing, just ensure that it “masks” the target material to prevent damage underneath…