There is a small hole, 1/8", under each side of the rear window for draining the seal channel. Look up unto the trunk with the liner removed and you will see them. When my seal was leaking I could feel moisture at those holes. Also the rear seal has a depression at the bottom sides of the window where water can pool up and filter down between the glass and the seal. I sealed my windows with permatex ultra black by masking off the body and the chrome and applying a thick bead with gloved finger. Time intensive but the fix was low cost, and if done neatly and trimmed, will go unnoticed.