[Odd Job]

There used to be a product called seek and seal, not sure who it was made by, but I used it on a Metro of mine around the windscreen, and it did a brilliant job.
It was very "runny" almost like water. You put it around your windscreen rubber, let it run into all the nooks and crannies and just left it to dry.
It worked for me. Much better than loads of silicone sealant and the like.