Just to clarify, it doesn't re-inflate the tire. It only re-beads it. You still have to inflate it to the proper tire pressure.

We used to do this all the time off-roading. When off-roading you often have to drop the tire pressure way down to give you more traction. Unfortunately, doing this makes it much more likely that the tire will release itself from the edge of the rim. This is why a lot of off-roaders run beadlock wheels, which allow you to run very low tire pressure without blowing the bead.