03-26-2010, 06:30 AM
When mudding drywall seams, you can use a blade about 10" wide on the tapered edges because the tapers will contain the tape and mud and allow for a smooth and flat finish when sanded. If you are taping butt seams, it is best to taper out the mud on 1' from each side of the seam to hide the buildup of tape and mud. If you are wanting to hide the seams on Hardipanel, you will have to taper out at least 1' from each seam because there is no tapered edge. This is a lot of work and it takes an artful finisher to hide those seams on a smooth-finished wall.