I use them a lot! As long as label says washable..they should be fine..I have a fridge full of them! I just used them for lining up 9 patch rows..I have never, ever gotten such precise seams before with any other method! I glued, lined them up, then flipped the top fabric back to check..if seams weren't exactly right, the glue is "greasy" and you can easily slide the top fabric to the right or left, until it's perfect, then pinch it to set it, and sew away...easiest method I've ever used.