For me, mixing paint is an action that involves an old screwdriver or a scrap of wood. The Mixing Mate paint lid claims to simplify the process of mixing paint or stain in the can: it combines a one-quart paint can lid with the properties of a coffee grinder and one of the maple syrup dispensers from IHOP.
The Mixing Mate seems to work well from what I’ve seen, but for some reason I’ve never needed the help getting paint mixed or pouring it into a can or tray. Normally it’s a rite of passage to open up a can, stir it up, then spill paint everywhere before learning to control the can. After the first time it really isn’t an issue anymore. Plus, if you want to switch paint or materials you’ll have to wash the thing off really well or you’ll be making a different color than you thought.
On the whole it looks like it’d work, but so would a screwdriver and 15 seconds with a paint stick.