Exactly. Even if you don't have a hard top, it is a great idea to apply it to your rubber seals/gaskets on the doors, trunks, and convertible top header. I also put some on my clamshell although that isn't really a rubber gasket. The Boxster chassis was designed as a convertible and is pretty stiff, but it still flexes and those seals are quieter with some gummi phledge on them.