Yep, it'll work with all materials.
For thinning scales, it all depends on what style I'm making. If their the flat sided with beveled edges, I'll use my sanding block, and stick. ( piece of 2x10 board, with a sheet of 60 grt. sandpaper held in place with thumbtacks, and a paint stick, or equivalent)
I use it for cleaning up the saw marks, from cutting blanks, and thinning scales.
I use double sided tape to hold the blank or scale, to the sanding stick.
Attachment 342271
Just peel the scales off on occasion, and check your thickness with a set of calipers.