Is there a way to refresh the hook and loop on the rear window of my XK convertible? The interior cloth is falling away from the window at the center of the top and bottom of the window.

 

This thread will help you to reattach the rear glass, including detailed instructions with photos. It's an easy DIY repair with the right tools and adhesive. At under $100, it's inexpensive compared to the cost of a new top. Read the entire thread.

https://www.jaguarforums.com/forum/x...ble-top-97478/

P.S. I misunderstood your question. If the glass has not separated from the fabric, then the above link doesn't help. Self-adhesive Velcro strips are available in many stores including Target, Home Depot, fabric shops, and Amazon. That might work.