I took a fun foundation piecing class a long time ago at quilt shop. The instructor said before anyone asks why sew on a foundation you are going to answer that yourself. We sewed strips of all sizes and cuts to paper, pressed and squared. Then we sewed strips with no paper. Then she said choose which way you will use for the rest of the class. Everyone chose the foundation. There was a lot of different foundations to choose from. . I like the leave in paper, Ricky Tims Stable Stuff. It doesn't add weight to the quilt.