LWB Rear Window Leaking Fix?

[Stretch32]

Does anyone have any tricks for sealing up a rear window seal?

My car has now had 2 OE Porsche rear window seals installed and it still leaks. I'm thinking it may actually be the aluminum trim thats causing it since it doesn't seem to seat perfectly in the lower corners.

Short of replacing the original trim and another seal, could I run a bead of silicon sealant under the lip of the seal? Are there any other tricks anyone might know of?

Stretch

[mepstein]

Porsche sometimes used a small amount of dum dum in the corners. You can use a shaped piece of wood to help form the aluminum trim into the corners. The shaped piece of wood would be similar to a popsicle stick or tongue depressor but thicker. It might be that your original trim wasn't original to the car (just a guess) so it doesn't have the correct shape to seal up the corner. Water travels so it might not actually be a problem that starts in the corner. We never use sealant for glass install.

[Scott A]

Good advice.
I form the aluminum outside the rubber right on
the car. Raw. No rubber on the car.
Then you can see the gaps and corners. And see if it’s really following the form of car. Especially in the corners.
I think this too is important, I twist the aluminum corners, so they are not lifting, and will be pushing down in corners. And fitting the form of car.
It’s the aluminum that can push the rubber deep in the corners, not the glass.
Twist then the wrong way and they don’t help the rubber, twist the right way and it follows the natural design.

Then with a large amount of water and dish soap,
First rubber on glass, more soap-water, and add aluminum, insuring alum hook is grabbing the rubber.
Duct tape alum on rubber in strategic areas.

More soap- water

Install with rope.

A Little clay in corners, just under rubber, just to raise rubber that is in too far.

Sometimes I use wood and hammer to help aluminum, but very minor. But it still has to be really wet so it can move.

That’s generally how in try to get a good leak proof fit.

[Richy]

If you buy new trim I predict the fit will be as bad as the trim you have now . The factory installers used a rubber hammer at the end of the installation to contour the corners for a better fit , this probably needs to be done with your trim .

[Stretch32]

I’ll see if I can reform the trim for a better seal. I’ve got a rubber mallet and some non marring hammers. I may also try some dum dum sealant as well. I need to get the rear window sealed so I can install the carpet soon.

Stretch