I also use starch and steam. I don't think I've ever ironed anything without steam! I use starch vs. sizing, although I have used sizing as well. I saw a thread on another board a while ago that I 'think' said that sizing was for polyesther blends and starch was for cottons...could be wrong on that issue but might be worth googling if you're interested. But I have never found that it interferes with my hand quilting. Both are sprays.