5. Prop it up on a pillow or towel, drop a bottle in and let er rip. Mine has two speeds, I use the low speed, but your end design may favor the high ...
Shaking paint by hand is no fun anymore. When I was younger it was kind of cool to smack the bottle repeatedly against the heel of my palm, as my father did, in his model building days. After one day smacking my hand numb, I came up with this little beauty of a paint shaker. It works really good, and I hope that if someone puts one together, it works as well for them as it does for me, and that they too giggle with delight, having been freed from the drudgery of shaking long unused paints. Seriously, this thing will completely mix totally separated "thought they were beyond hope" bottles. I prop it up on a pillow in the other room, drop a bottle in and let it run. I didn't have any paints that took more than a couple minutes, but I have forgotten, and left bottles in for hours with no ill effects. Save your strength and muscle control for painting, don't waste it on shaking! Build this drone!
Step 1: What works, works!
1. The first incarnation of this was a pouch made entirely of clear packing tape. It was ugly, but it proved the concept. That a pouch, taped to the head of a shoulder massager, was a good paint shaker. The paints not only vibrate at a high rate, but bounce as well. The new one I made out of plain white poster board, it's $1 a sheet at dollarmart, and clear packing tape.