That black goop was probably Urethane.  Most glass/sunroof shops
reccommend urethane over silicone.  Because silicone can be corrosive.

Dan Moy
danmoy@cynet.net

On Mon, 16 Mar 1998, Mark McCulley wrote:

> At 12:52 PM 3/16/98 EST, DEREKWH125 wrote:
> >I noticed substantial leaks, on both driver and passenger side, after having a
> >new windshield installed last year using an aftermarket seal. Recently I had
> >the seal replaced with a factory seal and the leaks have stopped. I was told
> >by the glass guy that he has seen a lot of problems with the aftermarket seals
> >and only recommends the OEM.
> >
> I wached the installer replace my Vanagon windshield after it took a large
> rock last winter. He used *lots* of black goop all the way around, but
> especially along the bottom. It looked really messy when he was working, but
> it cleaned up nicely and hasn't leaked a drop.
>
> -Mark McCulley
>