Ouch. I would probably try to buff it out with some 150 grit. That Icing also looks like a good idea as long as it's compatible with the paint. Although I'd be afraid it would crack again on that join. Maybe caulking?
Glue will just crack again. imo. I hit all those types of joins/cracks with caulking. It's less likely to crack. At least then you wont have a black line showing..
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