I have a water leak on my 99 Vert. When it rains there's a pool under the back seat, driver side. After taking everything apart and shooting water at the rear quarter window, I found that the watershield was causing that problem. The black adhesive/sealant at the bottom came loose over time. I want to put it back on but I need to reapply new adheasive/sealant . I am assuming its waterproof. When I removed it, it was still flexibe and sticky. What did ford use there or what can I use? I attached a pic. Any help is appreciated.