I've tried popsicle sticks, but I still wind up with lumps when I'm trying to mix up paint, especially my soft plastic colors that have been sitting too long.
I drop two sst bb's into each new bottle when I open it, but they will get stuck in the bottom sometimes.
I guess that's an argument for more bait making, so they don't have a chance to settle out.
I used a Sawzall for most of my adult (alleged) life, and I will not be giving that a tryout as a paint mixer, thank you very much. Hahaha