So you won't end up with a bulky bump in your binding use this method to join pieces of binding together. Take the two strips of binding you need to sew together. Lay the first face up vertically. Lay the second face down horizontally with both ends squared to each other.
Pin together.
Mark, with a marking tool, from the bottom corner of the horizontal piece to the top right corner of the vertical piece.
Sew along the marking line. Be sure to back stitch.
Open the strips up and make sure your strip continues straight. If not, then do this over...something was off.
If the strip is straight then press open and trim off the excess fabric in the back.
