MixKwik - The Premiere Aerosol Can Mixer & Spray Paint Shaker - Patent # US D609,990 S - portable, electric, sawzall attachment for under $25
When you hand shake a can, it just doesn't get the product mixed well enough, so what you find is anywhere from 10 to 20 percent of product waste due to improper mixing. When you use this, it's dry, it's empty, and it comes out perfect.
MixKwik pays for itself! Lean more about it.