If you have the seal the correct way, and it stilll leaks, then your lid is bent or you need to adjust the closing of it. This requires, the bump stops, and hinges themselves. That was the last thing I did on mine to get it bone dry. Also, the catch for the lid needs a little adjustment. See if you can see another e30 to make sure you have the seal the right way. Also, if you close the lid and are inside the trunk, you should not see any light, but if the seal was backwards you would.