With a sunroof/moonroof, there is usually an outer seal, kind of a gutter all the way around, then an inner seal. To get to the drip, drip, drip stage, you gotta leak past the outer seal and fill up the gutter before the inner seal will start to leak. Before you start gooping any of the seals, check the gutter. There should be a drain hole to empty the gutter (clever, huh?). The drain hole leads to a tube running down from the roof and probably out thru the floor. The hole or the drain tube is probably plugged, and if you don't unplug it, all you will be able to do is slow down the drip.