[davei]

steven, the stickers provide a small air gap to equalized pressure between discs. Without the stickers, air in the space between discs would get heated, or become relative pressurized by altitude and go out of the spaces. Later, when cooled or going down in altitude, the air would try tro return, but couldn't as the bottom of one disc would stick to the top of the next. It doesn't necessary affect the top discs in the box, but the extra pressure of the top discs on the lower discs makes the problem worse. The result often was concave flight plates. Some would return to normal after a while, some would not. Not good.