You can go over lacquer with Testor's without doing that many coats. After all cresting paint has cured I dip the crown/crest in polycrilic gloss to seal the crest.
Nowadays I use Testor's flat paints as they seem to thin easier and cover better than many of the glosses. I generally lay a base of flat white where any light color cresting paint will be used. Darker colors like black, green, red, blue don't require that. Once you dip in Polycrilic gloss, the cresting becomes glossy anyway.