All of my buffing pads and my backing plate have the grip easy system for easy on/off. Once you put my backing plate on you don't need to remove it again. All of the buffing pads attach on top of the plate and you just pull them off.
My shelf life is at least 4 years. I still have bottles sitting around from some of my first work and still use them as back up when I need. I recommend temperatures' between 50-90 Degrees and storing the bottles in an upright position.