Use an air hose and blow them off. When i am tanning my snakeskins, i spray them off with the water hose before the tanning is complete and that way there is far less to worry about when trying to glue up the skins. \
Larry, i would bet that there could be several factors with your issue, and one of them could be the method in which the skins were tanned and also what your process was to apply them to the tube