The Shaker — an idea from Christian Raun’s domestic treasury, which you may enjoy.
I have often looked enviously at the painter’s shaking machine, because when I have to paint the paint in small cans of hobby color, it is almost no matter how long I shake them. There is always a dense lump of color in the bottom of the can, and when it is stirred up with a stick, often more color is left on the stirrer than the bit of paint I really need.
That’s why I’ve designed a simple mini shaker. In a wooden block, holes are drilled in just the size of the paint cans. The block is clamped onto a shaker with two heavy-duty rubber bands. It is important that the cans are completely tight in the holes — this can possibly be done with a toothpick as a wedge. After just 20 seconds of shaking, the paint has touched perfectly and zero spillage.