We don't recommend going past the garage door with the epoxy. It's garage floor epoxy paint and once you pass the outside edge of the door you're no longer in the garage. The epoxy will breakdown in the constant UV exposure. If you have a thin strip of concrete outside your garage door we recommend you take a small sample of the epoxy to your local paint store and have them color match it with some inexpensive outdoor concrete paint. This way when it gets beat up you can recoat with inexpensive paint rather than with expensive epoxy. You can end the epoxy at the inside edge or outside edge of the door. Use good duct tape such as Gorilla Duct Tape to form a nice line. Painters tape is too thin for our epoxy.