I also use a 2 1/2 inch strip. I Iron it in half, wrong sides together. I make a test before I start for real. I sew the binding with a 1/4 in. seam for about 2 inches onto the front of the quilt. Remove from the machine and turn the binding to the back to see if the folded edge falls where you want it to. (just covering your first stitch) Adjust your seam allowance to compensate for the batting you are using etc. Once I am satisfied I sew all 4 sides with my desired seam allowance and hand stitch to the back. The type and thickness of batting can make a difference in your finished edge. I hope this helps it is probably clear as mud LOL). Toots