Thanks for the info about your not using the glass primer. Well, if your window is still doing well after 1.5 years, it says something about how to applied it. It a previos post I mentioned that all of my adhesive was still attached to the primer, and none of it was left on the canvas, so it would seem, at least in my case, that the adhesive is coming loose from the canvas, versus the glass. Maybe some other forum members can verify this? Given the longevity of your fix, did you happen to do anything special by way of cleaning and prepping your canvas prior to gluing it all back together? I'm just trying to do the best possible job that I can in hope that I can fix this obvious manufacturing defect...

My 3m window primer is in the mail, and I will be posting some pictures of my project later.

Thanks again -- Bob