While it is possible to mud over torn drywall paper, it is generally not recommended. This is because torn paper can create an uneven surface that may not adhere well to the mud or joint compound, leading to a poor finish.
Additionally, mudding over torn paper may not address the underlying issue that caused the paper to tear in the first place. If the drywall has been damaged due to moisture, for example, it may continue to deteriorate even if covered with mud.
To properly repair torn drywall paper, it is best to remove the damaged area and replace it with a new piece of drywall or patch. This will create a smooth and even surface that can be properly finished with mud and paint.
If you are unsure how to properly repair torn drywall paper or do not have the necessary tools or experience, it may be best to hire a professional drywall repair service to ensure the job is done correctly.