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If you plan on heating your garage, you must install a vapor barrier when drywalling the garage. A vapor barrier protects your garage from frost and mold that can occur through condensation. If your garage is unheated, you don't need to install a vapor barrier. The only exception is if you regularly crank the heat in your car before getting in it. In this case, you may still want to install a vapor barrier, as your car can heat your garage.

There shouldn’t be any gaps between your walls and ceiling. These can be fixed with joint compound but that is only a fix, and it’s much better if your drywall fits correctly in the first place. Sometimes gaps can appear if your foundation shifts significantly but if this is the case, you have a much bigger problem than patching drywall.

You can prevent air leaks and sagging by gluing a drywall ceiling. However, not every drywall job is a good fit for Sheetrock adhesive, and many pros say ceilings are one of those cases. When you place them properly, drywall screws make ceiling Sheetrock part of your home’s structural support system. 

Adding glue won’t increase the strength of the drywall, and it can make it much harder for you to remove and replace damaged drywall. Adhesive can bridge gaps, though, and it can keep temperature-controlled air from escaping or entering through the ceilings, making rooms more energy efficient.

You should wait at least 24 hours between each coat of drywall mud before sanding and adding another coat. This ensures the mud dries completely, although drying time depends on temperature, humidity, and the type of compound used. Lightweight muds dry faster, while heavier all-purpose compounds take longer. Always check for firmness and dryness before sanding or applying the next layer.