I don't usually use it..but I had a top I just pieced that had bias edges. After I pressed it, I gave it just a light spritz of sizing. OH! Nice and FLAT..and now that I have 2 straight of the grain borders on it, I can heave a sigh of relief! I am also planning on using starch when I prep pieces for applique. I have not started yet because I dont' want to get side tracked from a needle turn I am making for my SIL.