Can your mix latex paint with its own tinted primer together and apply as one coat?
It will work over another latex paint, however it won't be as
scrubable as a normal top coat, and it won't adhere as well as a
paint over a primer. Better to apply the primer, then the paint. If
the surface is clean and deglossed though, you really don't need a
primer and can coat the surface with a quality wall paint.