As a retired body man and painter, I can offer some advice. There are only a few things to do. First, you could use clear and a fine tip stripping brush to layer inside the cracks, let it dry and then buff it smooth. Second, a full on repair and repaint, not cheap and not really needed. Third, if it is up high as you say and you cannot see it, just leave it alone, it will not leak water like a cracked seam this is just the finish. If it were mine I would probably just put a heavy coat of wax on it, and keep an eye on it to see if it grows. If it does, then I would suggest a full repair.
Good luck with whatever you decide to do and if you need more help just pm me.
John
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Retired Auto body teacher
2021 Arctic Wolf 3550 Suite
2019 F-250 Lariat Super Crew 6.2
Having lots of Fun traveling with my wife
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