How long does it take newly installed drywall mud to completely dry? How long does it take newly installed drywall mud to completely dry?

Although the manufacturer's instructions will tell you the waiting time before you attempt to sand or paint the surface, there are still other factors to consider before you can tell that the drywall mud has dried completely. First is the temperature and humidity in the area. On rainy days, when humidity is high (before rainfall) and in wintertime, when temperature is low, drywall mud will dry slower than in spring or summertime. Second is the thickness or thinness of mud application. The thicker the mud, the slower the time it will dry completely. The color of the drywall will help you know if it is dry. If it is still grayish in color, it means it is still wet. A totally dried drywall mud is white in color.

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