I’m going to replace the gasket on my rear window tomorrow. I’ve read that I need to put sealant between the chrome and the paint once everything is back together. But I’m not sure what sealant to use. Hopefully it’s something readily available.

 

Gareth
I use ordinary bitumastic roof sealant. It goes on easily, you wipe it in with a rag, then with white spirit and loads of rags it is dead easy to clean it up so it looks smart enough. For example

3M also make a dedicated windscreen sealer, that is not silicone - which you do NOT want - which is also excellent:
https://www.3m.co.uk/3M/en_GB/p/d/v000117804/

 

A follow up question. I’ve installed the new gasket and sealed the gasket to the body. Do I also need to seal the gasket to the glass? I don’t really think it was sealed before. I have the interior out of the car at the moment, and pools of water appear where the rear seats should be when it rains, so clearly this isn’t sealed properly.

 

yes, you must.