Industrial Grade Double Planetary Mixer includes two blades that rotate on their own axes, while they orbit the mix vessel on a common axis. The Mixer has the feature that after one revolution the blades have passed through the entire vessel, after three revolutions most materials have been mixed and after only 36 revolutions, the blades have contacted virtually the entire batch. The Mixer is used for mixing and kneading viscous pastes or putty-like materials. The Mixer has the feature that the blades continuously advance along the periphery of the vessel, removing material from the vessel wall and transporting it to the interior. Industrial Grade Double Planetary Mixer has capacities from 1/2-pint through 400 gallons.