TIL that pressing my own signatures with a bone folder too hard gave me shiny spots, and 40 pages of a practice journal taught me why | Bookbinders - Rigidtalk
Wow, so you basically buffed your own signature like a pair of shoes. Honestly the bone folder doesn't need that much muscle, it just needs a firm even press and the shine stays away. Forty pages of practice is a lot of trial and error though, so at least now you know your limit.