No, with regard to the front and rear screens, I wont reuse, I cut the screens out and be done with it, use genuine vw rubber,
I cleaned the glass and obviously the window hole was clean! a lot of effort to get the rubbers onto the glass as they're a nice tight fit, well I cheat a bit and use rubber lube , no not that sort,

the other sort

and also lube up the external part of the rubber then they get fitted as normal with a good rubber mallet and a cord.
the side windows I use a very very nice rubber that forms to a 50mm radius is super tight to the glass and metal and is just very discreet, no sealant needed,the lube helps bed it nicely, we cheat by sticking a U/S emitter in the van and checking round the glass

Mike
sorry bout quality as had to use camera phone but will take a close up of the seal tommorow for you
cheers mike