I agree Kirbert. I find some issues with carving, especially on pink, are solved when you mount the material. The reduced flex of the material lets you adjust tinier details better than when it is unmounted.

The difference of opinions on this may be the result of tabletop carving vs. hand held carving. I am a handheld carver so when I mount it, it has less give. When a tabletop carver mounts on foam and puts it on a table it has more give that the table alone would have.