I used it in place of freezer paper for turned edge appliqué but it stays in. I learned this in a class so this is the first time trying it. We didn't discuss the "washing" out though other than to soak it well in cold water. And of course I'm probably over thinking the whole process. I have mixed thoughts on whether I would use this method in the future. The prep was easier and the stiffness of the paper actually prevents me from taking my stitches too deeply into the pieces but that same stiffness makes it harder to hold it comfortably while stitching. And of course it is more expensive than freezer paper and starch.
Vicki in Colorado