I sew a lot of Half Square Triangles together. I mean a lot. Maybe too many.
I like the intersection on the backside to look like this.
But many times the backside looks like this. Darned if I didn't get the underseam going the wrong way.
Leftovers from Stitching Lines to the rescue!
I just tear off an inch or two from the leftovers in the trash and stick it underneath the seam allowance just before I sew over the intersection.
Keeps the seam going the right direction every time.
Oops! I didn't sew that seam very straight.
This is fast. It doesn't slow me down. Faster than ripping out all those messed up seams!
And since I am sewing over the Stitching Lines paper in the same direction as you sew when using it, it tears off easily.
Just one more way to get some more mileage out of your Stitching Lines.