Here is how I save sanding dust to mix with epoxy when I need to fill cracks in my late work. I keep just enough to help me if I am turning something and need to fix/fill a crack on something and I just mix it with some epoxy glue, and it works well for me.
Does anyone else have ways of doing it (maybe better than mine)?
I bought 25 of these little containers on the internet for like $5 or so.