Learn how to tape and float drywall to sound proof a room in this free construction tutorial video.
In this case, I told you about your mistake, don't worry about it because you're going to use this here to cover it up. I'm going to get some tape, put it on both seams. I'm going to show you how to use the tape right now for this seam. Just use some compound on there, both sides of it. Too long, too short, don't worry about it. Put it right along the seams, nice and straight. Put it a little more compound on it, that's how you cover your seams up. As well as this one over here, don't worry about it. Some more tape. Cover it.