Oh christ! This has to be the worst part of the rubbers on a mini.
Tip: if you have the boot type one (like i do) wait until a hot day, or week preferably in summer.
Yes indeed, i did use loctite and this works wonderfully. Place dabs of glue on top of the clips and if the clips stick up, use a rubber mallet to tap them down. I did this a couple of months ago and worked well. The boot closed up good but DID NOT close. It was about 20mm away from the latch. Christ we were pushing as hard as we could (2 people) and it still wouldnt compress up.
Maybe the warmer weather will cause the rubber to be floppier and it will bed in quicker.
Lets see where we are in about december