Yeah admittedly a "first world problem" but I literally just got the M Performance CF Spoiler from Sun Motors BMW ($397 + shipping - this place is awesome) and was about to install with Betalink (to help with any end lifting issues) casue I'm like I'll never want to replace this but now hmm what to do?
Since betalink is permanent the only other high strenth industrial adhesive that I know about and have used is E6000.
https://www.amazon.com/E6000-237032-.../dp/B004BPHQWU
Technically not as strong as Betalink so I'm thinking of using this instead of Betalink (where the instructions say to apply Betalink) and probabaly some on the ends as well plus taping it down and letting it dry for like 2 days and using the adhesive promoter. This should be only semi-permanent then...