Dear James: The drywall tape is coming loose on the walls and in the corners, so I pulled it off. What is the correct method to retape the corners so that it stays on longer? —Pamela D. Dear Pamela: If you have ever watched a professional tape drywall, it looks easy with little sanding needed. The typical do-it-yourselfer ends up having to put on five coats, leaving a huge pile of drywall on the floor from repeated sanding. Even if the tape never comes loose, a bad taping job is always noticeable. One of the most important aspects of a good taping job is selecting the proper joint compound. Start out with a pre-mixed bucket of compound. This is more expensive than mixing your own, but it will have the proper amount of moisture. Once you get some experience, you can mix your own and save a few bucks. A …