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Hmmm,
Haven't seen it with gasket cement before. You mean like Permatex / form-a-gasket ?
The old stuff with retort cement would harden and crack, then fall out from the vehicles vibration.
With a flexible cement, it might work but would be tough to get to look good.
You don't need the fire retardant rope. Try 2" backer rod with smaller ones then regular urethane caulk.
That's how gaps are filled in concrete walls and it lasts many years.
And urethane caulk is paintable.
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