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Looking for Recommendations on High Gloss Black Primer
(self.gunpla)
Tamiya is the go-to, IIRC?
I don't have any specific recommendations for rattle cans, but you'll likely get the best results from hobby-grade paints. Tamiya, Mr. Hobby, Alclad, Vallejo, etc. As you found, general purpose paints available at big box stores tend to be thicker as their intended use case is for around the house etc, where coverage and durability are typically more important.
Post any Gunpla related projects you have going on!