The mud is not considered completely dry until it turns completely white in appearance. When using hot mud you will notice it turn from dark grey to white. For instance, even though 45-minute hot mud may harden within 45 minutes, it can take several hours to dry completely depending on ambient temperature and humidity levels. Remember, the time associated with quick set drywall compound is the hardening time, not the drying time. If you need quick set drywall powder to set up faster than normal, mixing it with hot water instead of cold will usually do the trick. High humidity or cooler temperatures causes hot mud to take longer to set. The working time can vary slightly depending on a few factors. Hot dry conditions can cause 5-minute mud to set before you even get a chance to spread it on your patch. For example, 45-minute hot mud may begin to set up in 30-35 minutes. This refers to the length of time it takes from when the powder comes in contact with water to when it hardens and can be re-coated.Īctual working time is generally less than the time listed. For example, quick set drywall mud is sold in packages labeled 5-minute, 20-minute, 45-minute, 90-minute or higher. Hot mud is packaged according to the time it takes to harden. Manufacturers mix different amounts of hardening agents into the material causing it to set up at different times. Hot mud hardens as a result of a chemical reaction. When it comes to hot-mud, there is a difference between hardening and drying. Hardened lumps of hot mud cause scratches in drywall seams and make it very difficult to create truly smooth finishes. If a bag of hot mud contains even a few small pieces of hardened mud, it can render the entire bag unusable. Once quick set drywall mud hardens you cannot reuse it. When water comes in contact with hot mud it begins an irreversible chemical reaction that causes the mud to harden. Keeping the powdered mud dry is critical. The plastic lining keeps moisture out and preserves freshness. Quick set drywall mud comes in powdered form usually in plastic lined paper bags.
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