Shaker - $60 (Richard)

The unit was designed to shake things while maintaining their temperature in a bath of regulated water.
I’ve never used the water bath part.
But I have sanded/polished items on the shake table while they slid around on emery cloth with water dripping on them.
A fence at the edges bounced them back toward the middle of the table.
The shake table measures 12 inches by 15 inches.
You could customize the hold-downs to your need.
It wouldn’t shake 5 gallons of paint.
But you could probably shake one gallon.
Don’t know how long it would take.
It would certainly shake a quart or pint.
Shake speed is adjustable.
Unit is heavy, so it won’t move around.
Measures 16 inches wide by 26 inches deep by 13 inches high.