At guild the other night one of the ladies said she doesn't use warm and natural (my fave) at all because over time it will make oily spots on your quilt. Have y'all ever heard that before? Most of the others there acted like it was news to them...a few of the more "knowledgable" ones acted like "Oh yeah..everybody knows that." I spoke up and said I'd never heard it before. I could see a wool batting maybe, because natural wool is very oily. But cotton? Well, I guess there is cottonseed oil...