I wonder if it's lingering because it's inside the cap?? I used it to attach the furniture leg felt pad to the inside of the cap and then used it to attach the cap to the bow. They were my first bows with bottlecap centers so I wasn't sure how well they would adhere with hot glue. Since then I've only used hot glue and they have stayed on just fine. They're just stinky.
What if I put them in baggie with a dryer sheet?