I always tape the address label and also tape at the "licking" spots. Never had it returned for tape!! However one year I copied my signature on a photocopy machine, they kicked that back. Signature has to be in ink!!
Absolutely! That's what I use too. Just put it where the existing licky spots are and seal it up. I can never get them to seal either without it. I also use it on the label instead of tape.