Im with roxanne. I never prewash, i hate how it feels used out of the dryer, wrinkly and too soft. I just made a baby red and white quilt top that now i hope doesnt bleed. Ill try out the color catcher on that one and hopefully it will be fine since i didnt even think to pre wash red. First one ive made with red... if it does i guess it will go to my son lol and yes flannel shinks a lot. I prewash that if im mixing fabrics.