Almot wrote:
Dicor will eventually become harder after some years, though not as hard as a regular caulk. The problem is that Dicor flows too easily, difficult to work on vertical surfaces.
Be aware that there are two different types of Dicor available. The Dicor Self-Leveling Lap Joint Compounds is intended for horizontal application on roofs and will run down a vertical surface. There is also Dicor Non-Sag compound, intended for vertical applications. I haven't used it myself, but I assume it doesn't run too much to be hard to work with.