Before I get into the grotty details of the rust repairs let me share a recent project. All the door window seals on the car had disintegrated pretty badly and was crying out to be fixed. Cranking up the windows was everything but smooth and it was obvious some work was needed. I had put it off in order to fix more pressing MOT stuff but now the time had come.
Luckily this is one of my favorite repairs on a Porsche. The way the extruded aluminum profile door frames work together with the felt U-channel is just so beautiful and the result comes out great. If you have the right repro seals. I had learnt when restoring my 1970 911 that what seals you get from various online stores is a gamble.
My experience:
U-channels: When I did the 1970 back around 2011 I was provided (probably from ferdinand.se) with a set of U-channels that were pretty rigid. I think they were reinforced with a bit of metal mesh in the fabric as they are pliable and bendable to shape. These worked perfectly and I wasn't happy when I received a set for the 68 (probably from Pelican) that were totally soft. In the end the soft ones works fine once in the door frame and I couldn't say they're worse than the rigid/reinforced U-channel in any way. The rigid ones just feel better to work with IMO. looking into it now there may be a difference between years/SWB/LWB but I don't know.
Outer seal. (window scraper style). The original seal is a very simple seal, and the ones you get from PP are presumably for 964 or something and look way to modern. Comparison of the two seals:

I hated the look of the new seal and started looking around. International Mercantile showed the correct profile on their web page and the seal provided by them is correct. IM's rubber quality is a bit grainy and rubs off, so if someones knows that someone offers these seals in good quality rubber let us know. It looks really good though. Thank God for that. After postage, customs and the fact that I ordered more seals from IM that were also incorrect sourcing these little seals came to be extremely expensive
Inner seal. The disintegrating seal I pulled off the car was a simple pinch seal with one fuzzy side towards the glass (sorry, no picture of the original seal) but the repros - including the alleged correct item from IM - have a lip towards the inside of the car. I can't figure out how this lip will work with the door panel overrider so hopefully i'll find a correct looking seal eventually. The original seal does look very generic.

Maybe someone can shed some light on the version of this seal?
Sorry for long post. Here's a picture of a box containing - after all was said and done - one pair of very expensive seals. I can laugh about it now.
