I would be interested to know how well the serger thread holds up in quilting over time. I read (here, I believe) that serger thread is very weak because it is intended to be used in a serger machine where up to 6 threads are interlocked to make the serged stitches. The product is not manufactured with the intent of it being the only thread in any situation. I think if no stress will ever be placed on the quilting (stress from usage or washing) you could probably use it just fine in a wallhanging. I am of the opinion that we spend a lot of time, effort and money to make our quilt tops. Why skimp out with cheap thread in the end?