Walmart sells some and it is about $7-8. Also less is better. I am not sure how the hanging up aspect is working. I put the batting down on the floor or on several banquet tables placed next to each other. Then I put either the top or back on it. I smooth it down with my hands and an empty fabric bold. Then I lift about half and fold it on itself. I step back spray and fold it back smoothing it into place. Then I go to the other side and lift up the side that was not sprayed and put it onto the side that was sprayed. I now spray that side and then fold the fabric back into place all the time smoothing it down. I let it lay for awhile to let the spay dry then I flip it all and put on the back or front depending on which one I had done first. Then I repeat the routine.