My diabetes supplier doesn't carry it, neither could I find it at my local pharmacy.
Enter Super Nurse Friend. So I gained 6 vials of Mastisol before my vacation.
I had never used it, but I heard rave reviews from tons of PWD (people with diabetes) who used it to improve and prolong adhesive (specifically Dexcom).
So I tried it.
After a week of salt water, pool water, sand, sun, and sweat, (plus a week of being home) the dexcom remained.
Enter one of the most unique tan "lines" I have ever had.