I have only used fusable batting on a couple wall hangings. They were a little stiff, but did not wash to find out if they would soften up. I am afraid to try on a larger quilt because I am afraid to iron on the carpet...worried about melting the carpet. May be silly, but not going to take a chance. As for starch and basting spray...I starch stiff and have had no problems with the spray. I mostly use 505.