Leak in Vert top
 

I've had this leak in my top for the past 1.5 yrs. These are the pics of it. I've tried various methods to plug it, as you can see from the various goop. It's actually in a seam in the top and I can feel where the fabric is worn down from the outside of the vehicle when I rummage around, and I've obviously located it inside. It's the same location on both sides. Any ideas how to seal this?