Window sealant - which one

Have just picked up another Daimler V8 2.5 to drive daily. First job is to seal the window leaks which are in the usual place at bottom corner of rear window leaking into the boot and down the rear seat and up into the headlining. I remember having this problem years ago and was very difficult to solve as you cannot really dry the joint without removing the window. What is the modern solution to sealing the rubber to the glass? Sikaflex or specific auto sealant?

I used Tech 7. It is a builders sealant that remains flexible and can be applied in damp surfaces. Comes in the same type of standard cartridge used for caulk.

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In my opinion, there is NO alternative but to remove the winsdscreen and seal, attend to any corrossion on the pinchweld, buy a new seal

At that point I had a expert mobile windscreen guy attend my home and fit the seal and glass back into the body.

Cost me ~$80 cash for him to do this, and it was money vey well spent, as even he struggled with it…I would have failed…I took a pic of the Sikaflex type he used

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Agree with Tony entirely.
Be prepared for the need to do repairs to the metalwork when you take the windscreen out.
Allow enough time between removing and replacing the glass, maybe a few days to assess and repair and epoxy prime/ paint the metal.

Yes I agree normally that screens out and check for the rust etc. BUT I already have a complete rebuild project in the dry garage, so this is a daily runner while I do that. It has not done any miles in recent years and I believe it has been dry “stored” but MOT’d each year so repairs done as required. I hope you will accept I just need a temporary fix as damp can ruin the car inside very quickly. I can see lots of work that needs doing but it is just about getting it road ready right now. As I was driving it off the lorry home I had a friend stop me and book the car for their daughters wedding in April!!
I know Tech7 is supposed to work in damp places but I am still sceptical about those claims but will give it a go. It is not a big leak and as the car was restored by a Jaguar specialist some time ago with new rubbers I hope there is no rust hiding under the rubber. I did have a conversation with a Autoglass windscreen technician when my modern screen was replaced and he confirmed they do handle classic screens if it is pre booked at their depot and as I have done it once many years ago and don’t fancy doing it again.

I get a small amount of water in the boot when I wash mine but I have fitted a new boot seal and there is no evidence of this leaking - I can’t find any water on the inside of the seal.

Mine puddles to the right of the spare wheel well and close to the wheelarch, and the same place on the other side.

Could this be coming in through the rear window and finding it’s way unseen to a point above these places then dropping down to where I see it?

The rear window seal looks to be extremely sound.

It normally comes in at the corner of the rear window and then under the parcel shelf and down the C pillar and into the boot down the crevice where the inner wheel arch meets the rear wing. Mine is also leaking through the bootlid as no sealer was used on the number plate screws etc. No sealer was used on the glass side of the rear window either.
I have taken the door cards off today and can see that the doors have not been restored inside at all. I think I can save them if I work fast with rust converter and paint/sealer. New rear wheel arches have been welded in but the holes where the seat belt anchors go is empty so clear route for water from wheel arch into the rear seat pan. The list is getting longer!

After moving to Oregon (where it rains al lot) a number of years ago, I had a local glass shop remove the rear glass on my 3.8S and replace with a new rubber gasket which I took to them. It had to be stretched a bit to fit but they did it successfully. There were no rust issues at all. The hardest part was getting the chrome trims back in place. I ended up doing some of that myself. Overall job was good, no further leaks at the bottom of the glass onto the fabric trim.