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My experience was with an earlier Volvo glass moonroof but the failure and cure is similar. The glass roof is attached to a metal frame with urethane sealant to create one assembly. The exposed gasket is more of an air seal than waterproofing.
Vibration, sunlight, low temps and body flexing eventually cause the bond to separate - usually near a corner. As water runs to the bottom side of the glass in the rain, it wicks through the gap in the sealant (capillary action) and collects on the inside of the frame. Car motion causes the little droplets to collect into bigger ones that drip into the car.
The only correct fix is to remove the moonroof from the car (fairly easy), pull off the edge gasket, remove the glass from the frame - similar to cutting out a windshield, removing as much old sealant as possible, and resetting the glass with proper urethane sealant.
Two important hints; carefully mark the glass in the inside so that you can remount it very close to the original position on frame (don't forget to make a matchmark on both pieces so you don't remount the glass facing backward.) And, sit the assembly glass side up on a FLAT surface to set up, or else the frame may not be square.
The fuzzy gasket does not need to be glued except where the ends meet on the rear edge.
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Rainy day driving under Chinese water torture (leaky sun roof). 2-forum post. [900][1997]
Rainy day driving under Chinese water torture (leaky sun roof). 2-forum post. [900][1997]