How To Seal a 911 Targa, Porsche Video
This is an original Porsche tutorial about numerous means to seal doors and roof of the classic 911 Targa and to make the roof less noisy. Besides being extremely helpful, its unique eighties style makes it a pleasure to watch.
To my knowledge the video is available in German language only. I guess the voice track is not really required to comprehend, but feel free to comment on the article here in Grand Retro if you need assistance.