[tosh]

Cannot be repaired - you need new glass with the seal.
Never seen that before.

If you want to make it look better - get yourself a knife (craft knife used for cutting paper) and start shaving the raised bits off. I haven't had any luck sanding rubber, but a caramel wheel on a drill may be able to smooth off the high spots left after your knife work.

Caramel wheels are usually brown, so you'll risk staining your black rubber with caramel rubber, so that may not be the best option. Definitely try that on your test rubber before you attack the car.

 

[tosh]

Now if they did black ones... but they’d have to be called liquorice wheels.