I use the majic sizing and it works well for me. I was told not to use starch because it is grain based (isn't starch made from wheat flour?) and will attract rodents. I don't have a mouse problem where I live but I sure don't want to attract them and have them eat up my stash. Come to think of it, cotton is cellulose based so that might attract them too. I guess I need to sew faster to use up my stash....!!