Stay away from powder or other products like this. Pads stick generally because they are dirty. Keep your horn clean, and have it disassembled and oiled properly once in a while and you won't have a problem. You can have the pads that stick, carefully cleaned, or replaced if they are that bad. I've had he same set of pads in my flute for almost 20 years, with no appreciable wear. I'm a repairman.