I know I probably do it ALL wrong but I have not ran into a problem as of yet. I never prewash anything and when I am done putting on the binding I throw my quilts in the washer and wash them using hot water. I do throw in a color catcher~ and then throw them in the dryer. Not one is getting entered in a show but are meant to be used in the real world. If there is going to be a problem with them..ie...split seams running dyes...etc..I want to know before its out the door. So I start the abuse early. =)