Hello, I repaired a headlight, inside I jumped something out of the grass. However, I had to remove the spreader, which went quite well with the hot air dryer and a carpet knife. I scratched out the old glue residue, afterwards I will grind it cleanly. With what do I stick the glass back in? Sikaflex 221 I don’t like to take it, it always remains slightly elastic and if I have to remove the glass again, it is a fight to remove it. Otherwise, I still have Union cement, but I do not know how this behaves. Is that also so easily soft? Bzw. what is best for this purpose?