Mine has leaked since the day I bought my car. I have replaced the seal a couple of times but have never glued it in place. After I wash my car I usually remove the seal, dry out the channel and the trunk and replace it.

Also, when you buy the new seal they are much longer than what you need. You have to stretch the seal as you are tucking it into the channel. Sometimes there is as much as 18" that needs to be cut. After you install the seal, if the trunk is too hard to close, pull one end out of the channel and cut off a few inches, then remove the seal completely and begin to tuck back into the channel again, pulling and stretching to ensure the two ends will meet. You may have to do this a few times until the trunk closes as it should...