I've used this product quite a lot in my sewing....lining lunch bags, etc. If you follow the directions precisely, there is usually not a problem. It does need to be ironed on to the fabric. It becomes "one with the fabric" and is very difficult to remove. If you cut it a bit short of the seams, you don't need to sew it into the seam and it's less bulky, particularly at the corners. It really is a very good product. It does come different mil and in either gloss finish or matte finish, depending on what you want to use it for. Hope you try it again on a project that needs waterproofing. It would be perfect for wet bags.