New rubbers make windscreen installation much easier, but they can be wilful beasts when they’re fresh out of the packet. We installed the rubbers into the screen apertures a day or two before installing the glass, which gave them time to conform to shape.
So easy! Yeah, right. The trick is not to tear the rubber seals while installing the glass, and for that you need some kind of lubricant. The cheap way of doing it is to use lots of soapy water, inside and out- but there was no way we were getting soapy water all over our nice new interior.
Rubber grease to the rescue. Still thoroughly messy, but made for a much easier installation.
The rear quarter windows were much easier and cleaner to install though, again, the rubber seals will need some time to conform.