Today I found out Yes it is important to make you re-press your sashing properly before quilting, also especially when you QAYG sew them on starting from the same side of the quilt so it does not causes waves in the sashing. And I learned that friends are the best when they are willing to help you fix your problems even if it is too late to do any thing much about it. Thanks to ALL my friends. now I have to unpick some sewing and try it a different way.