The time it takes for mudded drywall to be ready for painting depends on various factors, such as the type of joint compound used, humidity levels, and temperature. In general, you should wait until the joint compound is completely dry before painting. Here are some guidelines:
Drying time: Standard joint compound usually takes about 24 hours to dry. However, it's essential to check the manufacturer's instructions on the compound used, as drying times may vary depending on the product.
Climate: The drying time can be affected by environmental factors like humidity and temperature. High humidity and cold temperatures can slow down the drying process, while low humidity and warm temperatures can expedite it.
Thickness of mud: If you apply a thick layer of joint compound, it will take longer to dry than a thin layer. For larger repairs or new installations, it's better to wait at least 24 hours, or more if the mud is still not completely dry.
Sanding: Before painting, it's crucial to sand the mudded areas to achieve a smooth surface. If you paint before the mud is entirely dry, you risk damaging the finish and creating an uneven surface.
To be safe, it's recommended to wait at least 24 hours after mudding before you start painting. However, to ensure the best results, check the joint compound's specific drying times and follow the manufacturer's guidelines for your specific conditions.