Back in Medieval England, it used to be the law that people had to hang up the sign outside the door of every pub. This might not still be the case, but there are still a lot of people who want to hang up a sign for one reason or another. And many of these signs, with messages like “CAREFUL, WET PAINT!” might be temporary. Using concrete tape can be one way to make sure that they stay in place until you want them down, but no longer. There are a lot of materials that people use to hang up…