I was having a hard time with mine coming off with just hot glue. I bought the foam circles from HG and they are so great and are pretty inexpensive. I put that inside the cap then hot glue to the bow. I haven't had another issue with them coming off.
Using the hot glue and the E600 is a great tip! I hate how toppers slide around with just that slimy stuff alone! I never would have used it for caps, so thanks