23 Here's where hindsight became 20/20 for us. We figured we would leave the trunk-lid weatherstrip for last since it was a rather easy item to deal with. Unfortunately, during the application of our 3M black weatherstrip adhesive, a drop of the adhesive escaped our tube and landed on our new trunk mat. Although we acted quickly, it was too late; the mat had a chemical "etch" where the adhesive had dripped. Heed our warning and install this gasket before any new detail items get put in the trunk.