How to harden a 'rubber bone'?
It would work perfectly as scales (handles) for an old hunting knife of mine if I could flatten it out somewhat.
Remembering an old trick from my youth, I have been soaking it in white vinegar and it has softened nicely without losing the patina. From my past experience I know it will re-harden if I allow it to dry out, but it will be more porous and brittle.
My thought was to dry it then coat it liberally with super glue or to soak it in a clear acrylic paint for several days to fill the pores.
I am looking for any ideas or suggestions that will help me in this project, whether they be ways to make my ideas better or something entirely different.