soft top roof damage

The top left curve of my rear window is coming away. (see picture below) I can see that the previous owner has put some black filler/sealant stuff on the top right of the rear, in the past to resolve a similar issue. Does anyone know what this sealant stuff is, or can anyone recommend a product...

Hi. The stitching has come away between the back window and the fabric. I've gone online and tried to find someone to repair it (fairly local) but to no avail. Can anyone please help. We live in Wakefield. I've attached some photos of the damaged roof. Many thanks Dean