We bought a used PUP, and whenever we unfold the bunkends, "stuff" flakes off the leftover material in the seams. It looks white, and kind of like really thin waxy flakes that break up immediately upon touch. We have have no idea whether Coleman, or the previous owner, put some kind of plastic sealer in the seams. Anyone else ever seen this, and what do we do to keep it from shedding? Is there something I can/should spray in these inside corners & roof seams that I don't know about? Since my wife doesn't know what it is, every use dictates that we take out the mattress pads & shake them - kind of a pain.