I have had leaking screen surrounds on two non-Volvo vehicles. The first one was sold with the leak. The other was fixed with Capt. Tolley's Creeping Crack Cure.
Not a joke, all the info, including US distributor, is here: http://www.captaintolley.com/
It does work, but bear in mind the inlet for the water may not be near where it drips out so it may take more than one application.
Work was good - retirement is better.
1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
1984 244DL, Manual.
1987 744GLE, Manual.
1991 960 3.0 24v, Auto.
1994 940T Wentworth, Auto.