Bentpole,
The fluidized cup is the same thing as a fluidized bed, it is a container made for powder coating. You have a cup that you pour your powder into and there is a air pump that pumps air into the bottom of the cup and keeps your powder from clumping up or getting packed in the cup. When the air is adjusted right it looks like boiling water. It give you a very even coating on your jigs and you don't use as much powder. I picked mine up from a guy on EBAY his website is
Welcome to TJ's Tackle The fluid cup was around $50 with two cups. You can buy extra cups for different color powder or you can just clean them out when you change colors. I hope this helps