The kit works exactly as advertised. First, pull the valve core. Then, install the correct amount of sealant and reinstall the valve core. And finally, plug in and run the compressor for about 8 minutes-which is exactly how long it took to fill the rear tire of our R1 testbike. The only down- side (aside from the eventual gooey mess when the tire is removed) is that the kit's a bit bulky, making it impossible to stow under the seat of a sportbike. Make room, though, and once you've fixed a flat on the road, you'll be glad you packed it.