The screen is fine. I don't think I would have mentioned aquarium sealant if I was talking about repairing the screen itself! LOL!

The part that is broken is the plastic frame that is supposed to be attached to the glass where the screen slides in and out. 2 of the 4 sides are no longer attached. The plastic is not actually broken; it has separated from the glass. So what I want to do is reattach the plastic frame to the glass.