Somewhat silly question.

There is some junk weatherstripping being sold on eBay and other places. This weatherstriping is almost flat and does not seal. It was on my Dart when I bought it, but in poor shape so I replaced it with weatherstripping that looked the same. It still leaked everytime I washed the car or got caught in the rain. I bought the correct weatherstripping from Steele Rubber Products and it solved my water in the trunk problem. Instructions come in the box describing the correct installation, long lip to the outside, away from the trunk.