Well, it does happen. Last summer, I had to glue part of my main slide wall back on. Fortunately, it was pulling off right at the interior trim, so I could pry it open a bit more and pump Liquid Nails in behind it. A combination of soft wood and poor aim on the brads used to secure it were the culprit. Brads don't hold worth a (sewer trout) in styrofoam. Clamped it down for a while and it's holding fine since then.