Much like backstitching your seams on a sewing machine, there are ways to secure serged seams to prevent them from coming undone. There’s not enough time in the world for me to separate the 3 or 4 strands and tie a knot. I like quick! And easy!
1. By machine
Stitches are secured when they are sewn over or crossed with another serged seam. If the construction doesn’t naturally lend itself to this, here’s another way. Allow a 2″-3″ serged chain at the beginning of a seam. After the needles have JUST PIERCED the fabric, and with needles down, raise your pressure foot and bring the chain to the front. It should be between the foot and the fabric. Lower your foot and continue to serge. It should catch your chain and enclose it.
To finish, have the needles JUST PAST the fabric and stop with the needles up. Raise the presser foot, loosen the seam slightly, and flip the work so what was the underside is now facing up. Serge 1″-2″ over the previous stitching. Be sure not to cut off the existing stitches with the blade and veer off the side at an angle.
2. By threading
Sometimes I forget to “sew” them down, so my backup (and usually preferred) method is this. Take a darning, or large eye blunt tip, needle and thread the tail under the looped stitches. I keep this needle right next to my serger so it’s accessible. I think this method can be a little cleaner and neater than the machine method.
3. by Fray Check
I specifically use this on roll hems but you could use it anytime. The roll hem stitches are so close together that just a dab of this seam sealant will provide enough security.