Use the cheapest copy paper. A small stitch to sew. Fold paper over at seam and I also either run a finger nail or a point down the paper seam line then pull paper off from the seam leave rest on but sew seam together and enlarge stitch slightly. Edges are thick and bulky especially in pictorial pictures in paper piecing.a spritz of water also helps to soften paper and stop the fly away all over the place just before pulling apart.
enjoy I do.