Hi Twisty,
The tapes are very strong. You only need to place the tape around the perimeter of the unit--no need to use more tape. They give most people a good 3-4 week hold. But we recommend taking the unit off after 1-2 weeks to clean the scalp and do a fresh attachement. Leaving the unit on longer causes the scalp to itch--it needs to be washed. If there are any gaps in the tape you can take a tooth pick and dip it in glue to fill in the spaces.
Regards,
John