Corner drywall techniques include filling the seam and covering both sides of the corner with 2 inches of compound. Another drywall technique involves cutting the corner tape and creasing it in half.
Use a 5-inch knife to push the corner tape into the drywall corner. Start cutting the drywall from the middle, and smooth down the tape on one side of the crease. Draw the knife along the other side of the crease in the same way.
Another drywall technique involves taping and mudding flat seams before taping the corners. The corner taping is done over three days rather than in one day. The first two days are for taping, and the last day is for applying the finish coat.