I had an entire answer set up for using Bottom Line in quilting, when I re-looked at your post. You say you are using it for piecing. This is something I really wouldn't do. A 60 weight thread like Bottom Line is not strong enough for piecing. It is great for quilting, but that is not what you were using it for. BTW, it isn't just this one brand of 60 weight thead that isn't strong enough for piecing, it is anything of this weight. Even for delicate baptism gowns of the finest batiste it is recommended you use a 50 weight thread. The 60 weight is reserved for embellishments.