Dear starching the quilt, You are on the right track!! I mix my starch same way, spray my pcs, and leave them under a ceiling fan on an old plastic table cloth to dry overnite. Next day I press them and mark if for applique or rotary cut them for reg pc work. By doing this pencil marks wash out and it is much easier to turn under for applique. When my quilt is finished I launder it as usual and all the starch and marks wash out!!