This isn't really packaging tape

Our artwork looks great on the "tape," however it's not really tape if the tape isn't sticky, is it? It came with sponges and directions on how to wet the sponge and rub on the back of the tape to make it sticky. But it doesn't stick very well to the packages. The whole purpose of the tape was to tape boxes closed for shipping. But I'm not sure the tape will actually arrive with the box. I'm afraid it will come off.