its not written in stone to go with a custom ,bespoke hair system,(base) iv never had one and been wearing for four years, you could go the other way and cut trim you're hair perimeter to match the stock unit contours as long as its not wildly off,

MAYBEE ONE DAY ILL MAKE A BESPOKE TEMPLATE

a really good adhesive is orwg, (oil resistant white glue)
iv been to the gym a few times and really perspired, iv worried but its been ok,most modern gyms have great air conditioning.

biggest variable as mentioned by paul is individual body chemistry,
humidity, location, time of year
these factors will determine how long the adhesive takes to break down and gradually lose adhesion.

enjoy wearing, makes the debonding woes worth while.

ANTHONY