I purchased a new rear hatch seal from Porsche who also sold me some sealant with it. Can anyone advise on the correct process for fitting this and where/when the sealant is applied?

Thanks in advance
Marti

Sealant?
I don’t think you need any on the hatch seal.
I replaced the hatch seal on the 79 over 10 years ago. (No leaks, has not come off, still good to go) I did have to remove the panel that has the rear visors to gain access and install.

Seal should press fit around the body.
Line up the seal (roughly) with the part that comes together towards the rear of the car. Start on the edge towards the roof and press fit over the “flange”
(I guess that’s what you’d call it) to begin, and keep press fitting it on that edge, working down both sides toward the rear of the car.
As you finally get to the rear, the seal should be a little longer than needed. If I remember correctly, there’s a “finger” on one side that protrudes out and inserts into the opposite end of the seal. You may have to cut off a little on the side that accepts the “finger”. Once it’s correct length, slip the finger into the other end of the seal. (Sounds a little funny....)

The new hatch seal (along w new teflon patches) should cure all leaks and hatch rattles. You’ll almost have to “slam” the hatch down as the brand new seal has some height to it vs the old one that’s probably like a piece of plastic by now.

Good luck with it, pretty easy and should only take a few minutes to install.