I have used a lot of serger thread to quilt with over the years. Problem I have found is that it is inconsistent and you will have thick and thin spots. Thick spots get caught in the needle eye and thin spots cause breakage. It has become more frequent in recent purchases so I have been going with connecting threads polyester cones. I have not had any issues with quilts coming apart but the I am a dense quilter so that probably helps. I say use it. Chances are it will last longer than the quilt. Fabric has become thinner and thinner.