trying to rig up a home made fluid bed. I sealed a 3 inch pvc pipe coupler on a sheet of poly plastic. I then cut some 3 inch pipe to go down in the coupler. I ran hose and valves from air pump into the coupler and shove a coffee filter down the coupler with the piece of pipe to act as a bed. seen it on a link on here. turned the air on after getting put together with powder in it and got volcanoes around the sides and that was it. kept messing and just could not get a different result. I did find an air leak around the barb going into the coupler, but I figured that it was getting enough air if it was making volcanoes. My paint is a couple years old and had some chunks in it but I busted them up and the paint seems to be fluffy now. Could it be the paint? heard that pro tech powder has a long shelf life. Any suggestions would be appreciated. thanks CF