Hello JJ and Welcome to the Forum.
I don't glaze flesh, so I can only speak to my experiences. Generally, I paint flesh opaquely. I do this because there is such a high quantity of opaques in my flesh mixtures. Glazing is best done with a transparent or semi-transparent paint.
Glazing is not about what medium you use - it is about what paint you use and how you apply it to the surface.
I have only once glazed into flesh. It was with Napthol Red Light, which is transparent. I glazed it over a child's fingers because they were still not quite red enough. The flesh painted underneath was opaque.
Hopefully someone who has glazed flesh successfully will be here to help soon.