Great info thanks everyone. One more thing I just read on the natural cotton batting I have. It states not to use it with very light and white fabrics because of natural oils in the cotton which can darken and cause spots on the lighter and white fabric. It's ok on medium and darker fabrics. Has anyone experienced this before? I've quilted for years, it's rather strange to be so concerned at this stage of the game but I have a stack of flimsies I've decided to tackle, sigh.