Wow, I can't believe this thread is still going...thought I'd post it and be the only one with the problem!
Mine is gargage kept (at least as long as I've had it. The car was a MI/NJ car before NY, so it has never been subjuected to super high temps, even in summer.
I think a solution to the overnight hold-down pressure might be a large vice clamp or two...question is...what adhesive? It looks like it was orginally some two sided foam/tape. You can see it in there now yellowed and dried up. I"m thinking somthing like that or Gorilla Glue. I plan on doing some browsing at Lowe's today