Originally Posted by
loosethread
It also helps if you cut the border fabric on the length of the fabric. Cross-wise it stretches some, length-wise it is more stable. I know it uses much more fabric, but it works.
When long borders are required I always tear the fabric. They come out straight every time. You may need to press the edges. I make a lot of queen & king size quilts & I wouldn't do it any other way.