I have double-paned french doors that have apparently lost their seal - there is a lot of moisture between the panes. Yesterday I noticed that on the outside of these doors (at the top of the glass), there is a white, sticky substance that looks like caulking dripping from between the window and the frame. I am assuming this is the seal itself. These doors are 12 years old and have had moisture from day 1, but I have never seen the sealant actually DRIP from the window! The advice so far for moisture has been to replace the glass, but I am wondering why the glass can't be taken out and the seal itself replaced. Is that possible? The glass is perfectly fine.....Ok, so I obviously know nothing about windows. Help me before I tear up something!!

 

Once the seal fails, nothing can be done to repair or reseal the insulating glass unit. You must replace the entire sealed unit with a new one.