Annoying door trim on D1

The front end of the lower rubber door trim on my rear LHS passenger door as come unstuck and is bending back. This means that it is catching on the front passender door and not opening. I have tried aralditing it back in place, using a clamp while it goes off, but it lasted 12 hours before peeling off again. Anyone know of anything that will hold it in place for good? I'm even considering getting a heat gun on to it to try to straighten it out, but I think the paint might not like that !